Based on the perspective of design tool evolution, this study undertakes a thorough review of how design tools in China’s coal design industry have developed since the founding of the People’s Republic of China—ranging from hand-drawn blueprints and mechanical drafting to Computer-Aided Design (CAD) and Building Information Modeling (BIM). The findings highlight the pivotal importance of technological innovation in driving productivity. At present, China’s coal industry has reached a critical phase marked by accelerated digital and intelligent transformation, signifying the emergence of new-quality productivity. Drawing on more than two decades of professional experience in coal design, this research investigates the application scenarios of Extended Reality (XR) and blockchain technologies within the coal design sector. It further explores the potential of AI-driven generative “Design Large Models” for enhancing design innovation, proposing a four-layer architecture for these models and forecasting their future application prospects. Guided by the productivity leap evolution approach based on technology diffusion theory, and in light of ongoing advances in intelligent design tools, generative “Design Large Models” and similar intelligent design platforms are poised to become key innovation drivers in the new era of coal design. They will serve as a core force propelling revolutionary digitalization and intelligence across the coal industry, ultimately contributing to the high-quality development of coal design.

Addressing the multi - hazard coupling threats and intelligent transformation requirements in coal mine safety production faced by CHN Energy Investment Group, a hierarchical, multi - dimensional, and internally - externally collaborative control mode for major coal mine disasters was constructed. Through field investigations, data analysis, and industry-university-research collaborative innovation, we systematically reviewed the current prevention and control status of four major hazards: gas, water inrush, fire, and rockburst. We proposed the principles of “ graded governance of concurrent hazards” and “ classified governance of single hazards”. A nine - dimensional control system covering safety production capacity, planning, and intelligence was constructed, supported by a “ group-subsidiary-mine” three-tiered responsibility chain and a full - process mechanism integrating “ source prevention - process control - scit funding guarantee. ” The key initiatives include phasing out high-risk production capacity, formulating a five-year hazard prevention plan, a transition from experience-driven to data - driven hazard management. significantly enhancing the mine disaster resilience. This research outcome propels the transformation of coal mine safety production from passive response to active prevention and control, thereby providing theoretical underpinnings and practical paradigms for energy security assurance under the dual carbon (carbon peaking and carbon neutrality) goals.

The high-salt wastewater produced by the concentration unit of the reuse water unit of a coal chemical enterprise in China Coal Inner Mongolia Mengda New Energy Chemical Co. , Ltd has the characteristics of large COD change, high hardness, high total silicon and high salinity. It is discharged to the evaporation pond for drying. After technical transformation, the process combination is adopted as high-density tank + multi-media filter + ultrafiltration + ion exchange resin + reverse osmosis + silicon removal sedimentation tank + purification + nanofiltration + advanced oxidation (AOP) + multi-effect evaporation crystallization. The waste water recovery rate is 98%, which is used in circulating water station. The by-products of sodium chloride and sodium sulfate meet the Grade I standard of industrial dry salt of "Sodium Chloride for Coal Chemical By-product Industry" (T/CCT 002-2019) and the grade A standard of "Sodium Sulfate for Coal Chemical By-product Industry" (T/CCT 001-2019) respectively. The mixed salt rate is about 11.8%, and they are disposed of according to hazardous waste. It realizes the resource utilization of waste water and salt. This paper introduces the process selection, engineering design, project investment estimate and operation effect analysis of the project．

Coal is the main primary energy in China, and controlling carbon emissions in the development process of coal industry is an industry sector that cannot be ignored to achieve the goal of carbon neutrality in China. Accurate carbon emission monitoring and accounting is the basis and premise of the implementation of all carbon emission reduction technologies. Based on the whole life cycle method and the conventional process flow of underground coal mining, the main sources and accouting boundaries of methane emission during underground coal development are analyzed. Aiming at the key emission source CH4, the methane calculation method in the existing carbon accounting model is summarized. Combined with the current “dual-carbon” development strategy of "carbon to peak carbon neutrality" and the spirit of the latest agreement of COP28 of the 28th United Nations Climate Change Conference, the existing problems and technical problems of methane calculation methods in the carbon accounting of coal mines are discussed. It is pointed out that methane emissions from underground mining and post-mining activities are the key monitoring objects in coal mining process, the main reason for the large deviation of carbon accounting, and the important direction for future fine monitoring and accounting. On this basis, the existing problems in monitoring of Jinggong coal mine and the future development direction of technology are analyzed.

In recent years, the coal industry has become a benchmark for leading the construction of green, low-carbon, and sustainable development by implementing the sustainable development concept of resource conservation and environmental friendliness, and developing green buildings. This article analyzes the application of green and energy-saving technologies, materials, and processes in the construction process of mining buildings, calculates the added value of investment and energy consumption separately, and quantifies them to form investment increment and benefit increment. With the help of economic evaluation models, it demonstrates the economic rationality of achieving zero carbon buildings in coal mines.

In order to solve the problem of asymmetric damage of the floor of the gob-side roadway under the influence of dynamic pressure due to tense mining relationship, on-site research, theoretical analysis, numerical simulation and on-site industrialized test is adopted to take the 5209 return roadway as the object of research, and the formula to calculate vertical stress on both sides of roadway during the roadway excavation period and after the upper face mining by the mechanical analysis is derived. The mechanism of asymmetric floor heave in roadway was elucidated through numerical simulation analysis. The results showed that the stress superposition caused by excavation and working face mining was manifested as the stress on the coal pillar side of the roadway being greater than that on the solid coal side, and the asymmetric distribution of stress caused asymmetric deformation of the roadway floor. The displacement curve of the roadway floor by numerical simulation during roadway excavation shows a symmetrical distribution, with a maximum displacement of 29mm. The deformation of the floor during upper working face mining is asymmetric. The displacement of the left floor of the roadway is maximum at a distance of 0.5m from the central axis, with a peak displacement of 593mm. The plastic zone of roadway gradually expands during the upper working face mining, the depth of the floor failure is 5.5m. According to the principle of collaborative control of roof, sides, and floor, the cooperative control scheme of "leveling floor + anchor cable support + concrete hardening" is proposed and successfully applied in the field practice.

Aiming at the problems of significant roof settlement and bolt fracture of expansive and weak-cemented soft rock roadways in western China, in No. A4301 transportation gateway of Six mine of Sail, the physical and mechanical characteristics of weak-cemented soft, the deformation and failure characteristics of roadway surrounding rock and the instability mechanism of anchorage body were studied. Then, the corresponding surrounding rock control technology was put forward and applied in the field. The results showed that the clay mineral content of the weakly cemented rock on the roadway roof was high, among which the montmorillonite content was more than 10%, the average disintegration time of sandy mudstone was 0.97h, and the average expansion rate was 5.43%, which had significant expansion. The self-stabilization ability of expansive and weak-cemented soft rock roadways was poor, and affected by the fissure water of No.5 coal seam, the roof subsidence and floor heave were strong, and the failure rate of bolt support was high. The role of bolt support is to enhance the equivalent cohesion of surrounding rock in the anchorage range. The greater the pre-tightening force applied, the better the supporting effect was obtained. Under the requirement of supporting strength, the deformation of bolt should be coordinated with the subsidence of roof separation. The field practice shows that the coupling control technology of "anchor network cable-spray-injection" can effectively control the deformation and failure of the surrounding rock of expansive and weak-cemented soft rock roadways, which provides a reference for the stability control theory and technology of surrounding rock engineering of this kind of roadway.

In response to the severe damage problem of deep and large section tunnels in the Dahaize coal mine, this article summarizes the characteristics of on-site tunnel damage through on-site investigation and reveals the mechanism of tunnel damage induction. On this basis, a targeted support optimization scheme with high bearing capacity flexible anchor rods as the core was proposed. In order to verify the rationality of the optimization plan, a Trigon model was established using UDEC, and the deformation amount, plastic zone range, and distribution characteristics of rock fractures in the roadway were compared between the original plan and the optimized plan under two different conditions. The simulation results show that after adopting the optimization scheme, the bearing capacity of the surrounding rock is significantly improved, the deformation and plastic zone range of the tunnel are significantly reduced, and the number of internal cracks in the surrounding rock is significantly reduced. After conducting industrial tests on site, the surrounding rock of the roadway tended to stabilize at 50 days, with a maximum subsidence of 197 mm in the roof. The overall shaping effect of the roadway on site was good.

In order to solve the problem that the sealing material for long-distance layer drilling upwards will squeeze out the front end plug of the drilling due to its own gravity and it is difficult to penetrate the upper side of the long-distance layer drilling upwards. Adopting a new "two plugs and one injection" sealing process to solve the problem. Through simulation experiments using 80mm diameter steel pipes to simulate drilling, it was found that the material of the sealing section filled the entire sealing space, and the slurry at the front end of the bag was tight. The on-site experimental study on the gas drainage roadway of the 20 # coal seam floor in the 12 concentration roadway of Zhongheng Coal Mine in Guizhou Province shows that the new "two plugs and one injection" sealing technology is less affected by changes in drilling angle, and its average gas drainage concentration is always above 60%. However, the average gas drainage concentration of the "two plugs and one injection" sealing technology always decreases with the increase of drilling angle, and its maximum average gas drainage concentration is only 36.3%; The average gas drainage concentration attenuation rate of the new "two plugs and one injection" sealing process is less than 0.02, while the average gas drainage concentration attenuation rate of the "two plugs and one injection" sealing process is greater than 0.2. The results indicate that the new"two plugs and one injection" sealing process is more suitable for upward long-distance drilling through layers than the "two plugs and one injection" sealing process.

This paper proposes a vertical well plane connection measurement method based on single wire point combined with gyroscope orientation, which is relatively simple compared to the traditional connection triangle method. It can quickly transfer the coordinates of a single point on the ground to the underground, and then provide accurate plane starting datas for underground engineering by adding gyroscope orientation at the starting edge of the underground; The paper analyzes the principle, error sources, and accuracy estimation of this method, and verified it with specific engineering examples; The research results indicate that this method has certain feasibility and effectiveness.

In view of the fact that the original support scheme of auxiliary transportation roadway in 071602 working face can not effectively control the floor heave of roadway, the scheme of "floor grouting + grouting bolt (cable) combined support" is put forward on the basis of the original support scheme. Firstly, the deformation and failure mechanism of roadway floor heave is analyzed and determined, and the "composite beam" model of anchored layered floor is established. It is determined that the roadway floor heave has a negative correlation with the surrounding rock stiffness of the floor, and a positive correlation with horizontal lateral pressure and vertical uniformly distributed load. The change of elastic modulus before and after the optimization of the support scheme is calculated, and the support stress of the optimized support scheme is 0.44MPa higher than that of the original support scheme. The range of stable area with small deformation is increased by about 1 times. In practice, the displacement of roof and floor and the deformation of the two sides of the optimized support scheme are reduced by 1099mm and 503mm respectively compared with the original support scheme. The optimal support scheme can better control the floor heave deformation.

This study, taking the 220608 and 220707 working faces of Zaoquan Coal Mine as the research background, explores the development patterns of the "two zones" (caving zone and water flowing fractured zone) in the overburden rocks during the mining of close coal seams under multi-key strata conditions. By adopting a combination of theoretical analysis, borehole inspection, and numerical simulation, the results show that when only Coal Seam 6 is mined, the heights of the caving zone and the water flowing fractured zone are 8.45m and 28.64m, respectively. However, when both Coal Seams 6 and 7 are mined in close proximity, the heights of these two zones increase to 23.19m and 55.24m, respectively. Through the quantitative analysis of borehole inspection observations and the characterization of plastic zones in numerical simulations, the development patterns of the "two zones" are summarized. The study finds that the breaking of key strata significantly affects the development rate and range of the "two zones", with the phenomenon becoming increasingly evident in areas controlled by key strata. This research provides an important reference for the safe production of coal mines.

In order to achieve accurate, efficient and stable gas drainage in soft coal seams, in view of the problems of large drift of deep borehole drilling trajectory in soft coal seams, low permeability, poor drainage effect, and high scrapping rate of boreholes that are easy to collapse, Deep borehole directionally integrated technology, "drilling-punching-protection " to enhance permeability and promote drainage in soft coal seam was proposed. The technology realizes the directional drilling process through the combination of sliding drilling and composite drilling, changes the stress environment of the coal body through the hydraulic punching process to achieve enhanced permeability and promotes drainage, and provides a certain support for the borehole wall through the screen tube protection technology to ensure gas drainage mining channel. On the basis of directional drilling technology theory, hydraulic punching enhances permeability mechanism, borehole collapse failure characteristics and influencing factors, the technical equipment and process were introduced, and the key parameters of the "drilling-punching-protection" integrated technology were simulated and studied, and the "drilling-punching-protection" integrated enhance permeability and pumping promotion tech-nology was applied in Shanxi Changping Coal Industry Co., Ltd. Engineering practice shows that: in the soft coal seam, the deep borehole directional "drilling-flushing-protection" integrated anti-reflection enhancement and drainage technology is implemented, and the maximum total footage of a single borehole reaches 1942 m, which lays the foundation for ensuring accurate drainage; the longest stable drainage The time exceeds 450 days, the cumulative amount of gas drainage in a single borehole exceeds 100,000 m3, and the borehole protection rate reaches a maximum of 92.6%, realizing the borehole protection of the entire borehole section, breaking through the inaccurate drainage area of soft coal seams, poor drainage effect and low efficiency and other difficult problems, realizing the precise, efficient and stable gas extraction from deep boreholes in soft coal seams.

Aiming at the problems that it is difficult to locate the faults such as cable aging and damage in coal mine, the cable fault location technology based on frequency domain reflection method is studied. Inject a frequency domain signal into the cable and obtain the waveform of the reflected signal, windowing the signal, distinguish the fault type of the cable according to the waveform change of the reflected signal, and locate the fault point according to the transmission speed of the signal in the cable. The non-destructive location and on-line monitoring of cable fault in coal mine are realized.

Abstract：The stress distribution and plastic zone range of roadway surrounding rock are important reference indexes for the design of roadway support parameters. Because the section shape of rectangular roadway is easy to cause stress concentration, taking the return air roadway of 3202 working face under the influence of Wangcaihuopan mine fire area as the engineering background, based on the theory of complex variable function, the mechanical model of surrounding rock stress of rectangular roadway is established, and the complex variable function solution of surrounding rock stress and its plastic zone range are obtained. The influence of roadway aspect ratio and lateral pressure coefficient on stress distribution and the factors of plastic zone development of surrounding rock are analyzed. The comprehensive support scheme of optimizing bolt ( cable ) support, using I-steel shed to suppress roadway surface deformation and grouting to improve the mechanical properties of surrounding rock is put forward. The research results indicate that the stress distribution of the surrounding rock in rectangular roadways exhibits significant non-uniform variations, particularly with noticeable stress concentration at the shoulder corners of the roadway. The development of the plastic zone shows a typical ' X '-shaped distribution characteristic, and this failure mode is significantly coupled with the stress redistribution process in the corner regions of the roadway. The optimized support scheme significantly improves the distribution range and stability of the stress concentration area of the surrounding rock, reduces the deformation of the roadway roof and two sides, effectively controls the deformation of the surrounding rock of the roadway, and forms a good coupling effect between the support body and the surrounding rock. Through field engineering practice, it is verified that after adopting the optimized support scheme, the roof subsidence is 37 mm, and the two-side shrinkage is 19 mm, and the control effect is remarkable. Keywords: stress distribution of surrounding rock; complex variable function solution; support optimization; numerical simulation; field application

A multi-objective locust optimization algorithm (MOGOA) optimized variational mode decomposition (VMD) and least squares support vector machine (LSSVM) fault diagnosis method is proposed to address the difficulty in accu-rately diagnosing bearing faults in coal based activated carbon production equipment. Firstly, the MOGOA algorithm is introduced to optimize the penalty factor and decomposition level of VMD by introducing a composite fitness function based on permutation entropy and kurtosis reciprocal normalization. Secondly, use optimized VMD de-composition to extract bearing vibration signals and select sensitive variational mode components (IMF) for recon-struction. Finally, by optimizing the LSSVM model through MOGOA, a MOGOA-LSSVM fault diagnosis model is formed. Compared with the GOA-LSSVM method, verify the advantages of the proposed method in fault diagnosis.

In order to solve the problems that the bearing of the cutting part of the shearer is prone to failure in complex environments and the practical application effect of the existing fault diagnosis model is not good, a fault diagnosis method for the bearing in the cutting part of the shearer based on the Improved Complete Ensemble Empirical Mode Decomposition with Adaptive Noise (ICEEMDAN) and the improved Support Vector Machines (SVM) was proposed. Then, the energy features of the reconstructed IMF components are extracted, and a high-dimensional feature matrix is formed with the time-domain frequency domain features extracted from the reconstructed signal, and the PCA dimensionality reduction algorithm is used to reduce the dimensionality. Finally, the improved Support Vector Machine (SVM) classification model is used to diagnose and identify the faults of the low-dimensional feature matrix, and compared with a variety of mainstream classification algorithms. The training results show that the proposed method has a fault diagnosis accuracy of 99.3%, which is 3.9%, 1.1% and 1.7% higher than that of SVM, PSO-SVM and GA-SVM, respectively, and still has a classification accuracy of 95.2% under the noise condition, which is 8.9%, 3.9% and 3.1% higher than the other three classification models, respectively, and the convergence speed is faster. It has a classification accuracy of 94.7% in practical engineering applications, which can effectively improve the intelligence of coal mines.

The high temperatures generated in the combustion area during underground coal gasification can cause structural damage to the roof rock. In order to study the effect of thermal damage caused by different temperatures (100 ℃, 200 ℃, 300 ℃, 400 ℃, 500 ℃, 600 ℃) on the acoustic emission characteristics and rupture mechanism of sandstone. The acoustic emission signals were collected and analyzed during the test by using the self-developed unidirectional heating experimental equipment. Research has shown that the positive correlation between the cumulative number of acoustic emission events and the number of internal cracks can better reflect the macroscopic damage scale of sandstone, with the most obvious fracture occurring at 400 ℃ -500 ℃. On the micro-damage, the cracks develop fast in the rapid warming stage of each temperature of the specimen. With the increase of temperature, the proportion of low-frequency decreased by 56.02%, and the proportion of high-frequency increased by 57.1%, and the main frequency was changed from low-frequency dominated to high-frequency dominated, i.e., the damage of sandstone was transformed from the dominance of intergranular slip to the dominance of fissure extension. Thermal damage of sandstone is a process of expansion and deformation, crack initiation, rapid development and cracks continue to develop through to destruction. Sandstone crack sprouting, crack development and crack nonstationary development correspond to changes in fractal dimension values of 0.35, 0.15 to 0.35, and -0.15, respectively, respectively. The mutation point between the irregular fluctuation phase and the sudden drop phase of the fractal dimension curve can be used as a signal to predict the formation of internal macroscopic fissures during the thermal rupture of the rock, which provides theoretical support for the design of reasonable mining width for underground coal gasification.

To explore the mechanism of damage and deterioration of fractured rock mass under the coupling effect of freeze-thaw and load, triaxial compression tests were conducted on rocks with different crack lengths and freeze-thaw cycles. The indoor test process was reproduced using PFC3D numerical simulation software and the reliability of the simulation was verified. The results show that during the freeze-thaw process, the relative content of small pores first increases and then decreases, while the relative content of large pores shows a trend of first decreasing and then increasing; The effect of confining pressure and prefabricated cracks on the mechanical properties of rock samples is opposite. The weakening effect of prefabricated cracks of 10 mm, 20 mm, and 30 mm on the bearing capacity of red sandstone is 25%, 66%, and 80%; The freeze-thaw cycle leads to the expansion of microcracks in the rock sample, making it easier to converge at the prefabricated cracks under confining pressure. The failure mode of the complete rock sample changes from tension to shear, and as the confining pressure increases, the fractured rock mass exhibits a shear failure mode, and the length of the cracks does not change the failure mode of the rock mass; By introducing the volume constitutive equation of water particles changing with temperature, the entire process of indoor freeze-thaw cycle test damage is reproduced. After 40 freeze-thaw cycles, the interior of the rock is fully damaged, and the number of cracks increases exponentially; PFC3D calculation shows that the failure point of the complete rock sample first appears at the loading point, while the fractured rock sample first appears at the loading point and the prefabricated crack. The overall crack curve presents an "S" shape, which can be divided into three stages: gentle, steep, and gentle. The longer the prefabricated crack length, the greater the damage to the rock sample, leading to a weaker ability of the rock sample to resist failure. The three-dimensional numerical simulation reflects the fracture behavior of freeze-thaw fractured rock mass, which can provide a basis for studying the evolution law of rock mass fracture in mining engineering.

Abstract：A substantial volume of coal gangue in China is generated in the Permian coalfield, however, research concerning the release pattern of nitrogen and organic matter from Permian gangue in different regions has been notably scarce. This study focuses on Baode coal mine and JiuLiShan mine, conducts constant temperature shock immersion experiment, which aim to compare and study the release law of nitrogen and organic matter in Permian coal gangue in the middle and western regions. Results showed that the nitrogen dissolved from the two mines was mainly ammonia nitrogen, and the dissolution had intermittent characteristics, in which the dissolution of "three nitrogen" and organic matter in Baode Mine is lower than that in JiuLiShan Mine, which is related to the content of the gangue and the mineral structure of the gangue itself. The pH of both gangue leachates was weakly alkaline, which may be due to the buffering effect of ammonia nitrogen on acids and bases. Throughout the experiment, both gangue organic matter had lower humification, less unsaturated aromatic compounds, and the UV254 of their leachates showed a decreasing trend, with little correlation with DOC. The research findings can help to scientifically evaluate the ecological and environmental impacts of coal gangue, and can also provide an important theoretical basis for the resource utilization of coal gangue.

To solve the problem of single and incomplete feature extraction types in ash detection based on flotation tailings images, a method for predicting the ash content of tailings based on machine vision multi feature fusion is proposed. An industrial tailings image dataset was obtained on the flotation field. RGB (Red, Green, and Blue) color features, grayscale features, gray level co-occurrence matrix features and color co-occurrence matrix features were used to describe tailings images. The relationship between features and ash content of tailing was studied through corre-lation matrix. Principal component analysis (PCA) was used to reduce the dimensions of primary feature space, principal components with different numbers were used as inputs, tailings ash content was used as output, and a support vector regression (SVR) model was built to predict the tailings ash content. The experimental results show that the multi feature fusion significantly improves the accuracy of the tailings ash content prediction model, provides a more comprehensive description of the tailings characteristics, and performs better than models that use a single type of feature as input. This method can provide a theoretical basis for the intelligent construction of flotation.

Aiming at the problem that the floatability of coal slime becomes worse after oxidation and has adverse effect on the flotation effect, the effect of oxidation degree on the floatability of coal slime and its mechanism are studied by using Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, spectrophotometer, contact Angle test, reagent adsorption measurement, unit flotation and step release experiment. The results show that for Suhaitu 9#, Guoyutela coal and Lutian 9# coal with oxidation degree of 21.10%, 48.30% and 53.25%, the higher the oxidation degree, the more functional groups such as -OH and >C=O and hydrophilic alumino-silicon minerals containing oxygen, and the less hydrophobic groups such as -CH3 and -CH2. The higher the proportion of oxidized part on coal surface, the more dominant the hydrophilic groups on coal surface, and the higher the hydrophilicity of coal, the worse the slime flotation effect. At the same time, the oxidation degree of coal increases, resulting in the reduction of the contact Angle of coal, the deterioration of surface hydrophobicity and the deterioration of diesel oil adsorption capacity. When the ash content of cleaned coal is 10%, the recovery rate of the coal with moderate oxidation can be increased from 11.81% to 43.54% compared with only using diesel.

In order to study the cutting performance of the bolter miner drum in the semi coal-rock roadway, the hardness coefficient f6.5 coal-rock was established by EDEM, and the simulation and analysis were performed on the drum cutting of coal-rock at various cutting thickness and traction speeds，and the coal mine cutting test was carried out for verification. The cutting process of the drums at different working conditions was obtained through simulation experiment. The effects of cutting thickness and traction speed on the cutting performance of the drums were studied and the cutting performance of the drums was evaluated by using the cutting force and its fluctuation coefficient, cutting-ratio energy consumption, and the flatness of the cutting coal-rock wall. The research findings reveal that the drum's cutting resistance undergoes an initial increase, followed by a stabilization phase, as the feeding process advances, and the cutting resistance of the drum fluctuates within a defined range. The coal mine cutting test proves that the simulation results are highly reliable. The cutting force of the drum and the traction speed have a direct and positive correlation, and the fluctuation coefficient and as the traction speed increases, the cutting-ratio energy consumption exhibits a downward trend. The regression equations of cutting resistance, torque and specific energy consumption are obtained by fitting by least squares method, respectively With the increase of traction speed, the flatness of cutting coal-rock shows a trend of first rising and then decreasing, and the larger traction speed is more likely to cause the rock ridge phenomenon at the junction of drum and reducer, which leads to low propulsion efficiency and affects the excavation and anchoring work. When evaluating the cutting performance, the flatness should be given priority; The second is the cutting resistance and its fluctuation coefficient; Finally, it is used as a measure of the cutting-ratio energy consumption of the drum cutting performance.

The risk of spontaneous ignition during the withdrawal of the working face is high, high quality injection gels material sealing air leakage in the goaf is an effective means to prevent fire extinguishing. The current gels injection device and process are difficult to achieve the precise of the gel components, which affects the quality of fire prevention and extinguishing engineering. This paper developed a precise automatic rubber pumping device, Taking the 21802 fully mechanized mining face of Qinglong Coal Mine as the project background, the key glue injection parameters were determined, the application test is carried out. The results show that the gel injection device with key parameters, Effectively reduce the CO concentration in the corner of the working face and the bracket. Compared with the large area of extensive gel injection, Greatly reduced the cost, ensured the safety of the working face during the period of mining and removal.