66 results about "Underground mine ventilation" patented technology

The invention particularly relates to an underground ventilation system, and belongs to the technical field of ventilation. The underground ventilation system comprises an air duct and a plurality of sliding rail assemblies. Each sliding rail assembly comprises a sliding rail part, a sliding part and a guide ring, the sliding rail parts of the multiple sliding rail assemblies are in butt joint in sequence, guide grooves are formed in the left side and the right side of each sliding rail part respectively, the guide grooves penetrate through the sliding rail parts in the length direction of the sliding rail parts, each sliding part comprises two oppositely-arranged wall parts, the sliding rail parts are arranged between the two wall parts, and the wall parts are rotationally connected with pulleys. The pulley is contained in the guide groove, and the guide ring is arranged corresponding to the sliding part and connected to the sliding part. The air channel sequentially penetrates through the guide rings. The system has the advantage that the air duct position is convenient to adjust.

The utility model discloses underground coal mine ventilation equipment, and relates to the technical field of coal mine ventilation. Comprising a barrel, a diffusion barrel is arranged at one end of the barrel, and a rotatable impeller is arranged in the barrel; a transmission assembly is arranged in the barrel and comprises a sliding plate capable of sliding relative to the barrel, a cleaning mechanism is arranged at the position, close to the impeller, of the sliding plate and comprises a guide seat and a limiting spring, the guide seat is fixedly connected to the sliding plate, a sliding rod slidably penetrates through the side face of the guide seat, and an elastic block is arranged at the end, close to the impeller, of the sliding rod. The sliding rod is sleeved with the limiting spring, one end of the limiting spring is connected with the guide base, and the other end of the limiting spring is connected with the elastic block. In the initial state, the elastic blocks abut against the inclined blades on the impeller. The self-adaptive cleaning device can be used for cleaning the blades in a self-adaptive manner, and normal flowing of airflow is guaranteed; the problems that the ventilation effect is reduced and the energy consumption is greatly increased in the operation process of underground ventilation equipment are solved.

The invention provides an underground coal mine ventilation control method and device, electronic equipment and a storage medium, and belongs to the technical field of mine ventilation. The method comprises the steps that the type and concentration characteristics of harmful gas in a target area are determined according to data collected by a biosensor array; determining time sequence data of the harmful gas according to the concentration of the harmful gas, and determining a target concentration change rate of the harmful gas according to the time sequence data; according to the concentration of the harmful gas, the target concentration change rate and the current underground acoustic wave characteristics of the coal mine, the target air volume of the target area is determined; according to the target air volume of the target area, the ventilation resistance of the target area and the current opening degree of the ventilation valve, the opening degree of the ventilation valve is controlled, and the ventilation air volume is determined. According to the coal mine underground ventilation control method and device, the electronic equipment and the storage medium, the ventilation quantity can be accurately and timely adjusted.

The invention belongs to the technical field of mine ventilation management and control, and particularly relates to an intelligent mine ventilation management and control method and system, and the method comprises the following steps: S1, data perception and fusion: collecting multi-source heterogeneous data from a ventilation facility, an environment sensor and a personnel positioning system through a multi-protocol data gateway, and generating a standardized data flow; s2, constructing and updating a digital twinborn body: driving and constructing the digital twinborn body of the mine ventilation system based on the standardized data flow; s3, intelligent deduction and decision making; s4, strategy execution and closed-loop control are carried out; and S5, edge autonomy. The heterogeneous data is integrated through the multi-protocol data gateway, and the standardized data stream is generated, so that a unified and high-quality data basis is provided for subsequent analysis, and the problem of information islands is solved. And the digital twin is dynamically calibrated based on real-time and feedback data, so that the simulation precision is remarkably improved, and the underground ventilation condition can be reflected more truly.

The invention relates to the technical field of mining underground ventilation, in particular to a mining underground ventilation device which comprises a main exhaust pipeline, and an opening and closing air door is provided with blades through a shaft body. A supporting telescopic rod is installed on the inner wall of the branch pipeline, a moving frame is installed at one end of the supporting telescopic rod, a sliding groove is formed in the outer wall of one side of the moving frame, a sliding connecting rod is connected into the sliding groove in a semi-embedded mode, and one end of the sliding connecting rod is movably connected with one side of a blade through a pin shaft; a self-locking assembly is arranged between the fixed end of the supporting telescopic rod and the outer wall of one side of the movable frame, and through the arrangement of the self-locking assembly, automatic locking of the blades in the closed state is achieved through the adsorption effect of a magnetic suction plate on a connecting shaft body of a first connecting rod and a second connecting rod; the problem that the air door is opened accidentally due to the fact that a traditional thread or buckle fixing mode is prone to loosening under the impact of airflow is solved, and the sealing reliability and the operation safety of the air door under the complex working condition of a mining mine are remarkably improved.

The utility model discloses a mine underground ventilation safety monitoring device, which relates to the technical field of ventilation safety monitoring and comprises a ventilation box and a connecting assembly arranged on the ventilation box. The mounting assembly is arranged on the ventilation box; the exhaust assembly is arranged on the ventilation box; the sliding groove assembly is arranged on the ventilation box; the filtering assembly is arranged on the sliding groove assembly; the sleeve rope assembly is arranged on the ventilation box; through the arrangement of the connecting assembly and the exhaust assembly, under the action of the exhaust fan, underground air can enter the connecting pipe from the suction port and is exhausted to the outside through the ventilation cavity and the exhaust pipe, then circulation of the underground air and the outside can be achieved, and the influence of dust caused by human activities on components is greatly reduced; the service life of components is prevented from being shortened, meanwhile, dust in air is monitored through the arranged air quality detector, and underground ventilation can be conducted in time.

The present application aims to provide a kind of coal mine underground damping type regulating air door and its using method, belong to coal mine underground ventilation technical field, including air door body, the window frame is equipped on the air door body, the outer end of air door body is equipped with shell, one end of window frame is hinged with air door body by hinge, the other end is connected with shell by window lock, a plurality of layers of damping net are equipped between window frame and shell, the outside of damping net is equipped with inner frame body, the upper and lower ends of window frame are equipped with slide rail, the slide rail includes the outer slide rail located in the outside of air door body and the inner slide rail located in the inside of air door body, the inner frame body is slidably connected with slide rail, the bottom of the inner frame body is equipped with control assembly.Damping type regulating air door, air flow area is large, and is flexible to block, air flow is not easy to penetrate to the coal body around air door, the probability of coal spontaneous combustion accident is greatly reduced, and the air volume regulating range is large, especially suitable for the area that air volume changes greatly.

The utility model relates to the technical field of underground coal mine ventilation, in particular to a connecting structure of a self-resetting air door frame and an air door plank, which comprises an air door frame and an air door plank, the air door frame is connected with the air door plank through a connecting piece, and the connecting piece comprises a mounting plate fixed on the air door frame. A pair of hinge lugs is arranged on the mounting plate, an outward-extending patch is hinged between the two hinge lugs through a hinge shaft, and the outward-extending patch is fixedly connected with the air door plate; a limiting piece is arranged between the two hinge lugs and located on the side, away from the air door frame, of the hinge shaft. The air door is simple in structure, low in manufacturing cost and convenient to install and maintain, the opening angle of the air door plate can be effectively controlled, the phenomenon that the opening angle of the air door plate is too large and cannot be automatically reset is prevented, and the potential safety hazard of air flow short circuit accidents caused by the fact that an air door is not automatically closed is eliminated.

The utility model relates to the technical field of coal mine underground ventilation equipment, and particularly discloses a double-fan automatic switching intensive installation device which comprises a roadway air duct used for being connected with a tunneling working face ventilation system. The section of the air duct switching device is trapezoidal, the small end of the air duct switching device is communicated with the roadway air duct, and the large end of the air duct switching device is communicated with the double-fan box frame; the double-fan box frame comprises a first-layer box frame and a second-layer box frame which are stacked up and down, and fan fixing bases are arranged in the first-layer box frame and the second-layer box frame respectively and used for installing a main fan and a standby fan; the triangular air duct is arranged in the air duct switching device, an air outlet of the triangular air duct is communicated with the roadway air duct, and two air inlets of the triangular air duct are communicated with the first-layer box frame and the second-layer box frame respectively; according to the double-fan automatic switching intensive mounting device, through the design of one-key fan switching, centralized mounting and fixing, stable structure, easy maintenance and the like, the effects of improving the working efficiency, reducing the safety risk and facilitating moving and centralized management are achieved.

The application belongs to the technical field of mine ventilation, and discloses a coal mine underground ventilation adjusting device, which comprises a water storage box. Through cooperation of the interception assembly and the exhaust assembly and other structures, the exhaust assembly drives the air in the mine and the water sprayed by the water supply assembly to flow to the side of the filter plate, and drives the spiral disc to rotate, and the coal powder contained in the air is retained on the side of the filter plate, the spiral disc rotates to concentrate the coal powder and water to the middle part of the filter plate and falls into the inside of the storage box, and when the coal powder in the storage box is excessive, the coal powder will be washed away by the water, the connecting rod will also drive the guide ring to descend and scratch the inner wall of the collecting pipe, and the mixture of the coal powder and water adhered to the inner wall of the collecting pipe will also fall into the inside of the storage box, so that the descending speed of the storage box is accelerated, and the working efficiency of the device is improved, and the water supply assembly also re-lifts the bidirectional telescopic rod to the initial state, so that the device can reciprocatingly clean and collect the coal powder.

The application provides a coal mine main fan frequency converter speed regulation method based on random wind speed field prediction. First, wind measuring points are arranged in underground stoping working faces, tunneling working faces and air shafts. According to various data monitored by the wind measuring points, information prediction is carried out, and a graph neural network is established to calculate air supply. According to the real-time air volume calculated by the graph neural network, the relationship between the control frequency of the main fan frequency converter and the real-time air volume is obtained, and the frequency converter control frequency is calculated. The beneficial effect is that the present application takes the random field as the theoretical basis, takes each key ventilation detection in the underground as the vertex of the random field, takes the ventilation detection result as the attribute of the vertex, establishes an underground ventilation control random field model, then establishes a field data prediction model to predict the future information of the wind field, thereby guiding the ventilation regulation of the main fan and effectively improving the response speed of the ventilation control.

The invention discloses a method, a system, equipment and a medium for determining underground coal mine ventilation volume, and relates to the technical field of coal mine ventilation management.The method comprises the steps that when a minimum loop is searched, the priority weight of each remaining branch is determined with the level of a breadth-first spanning tree of a tree node as a weight factor, searching is started from the remaining branch with the minimum weight, and a plurality of loops are constructed; extracting a closed loop with the least residual branches; meanwhile, dynamic weights are set according to the number of remaining branches, the loop with the minimum sum of the weights of the remaining branches is selected as the minimum loop, and it is ensured that the calculated roadway air volume is consistent with the actual value. In addition, the air flow direction is judged through the edge relation, the air volume symbol is adjusted, the abnormal direction is corrected, and the calculated air flow direction fits the reality.

The invention relates to a coal mine local ventilation system health state diagnosis method and system oriented to global elements, and belongs to the technical field of coal mine underground ventilation safety monitoring. The method aims to solve the problems of isolated monitoring, passive response, one-sided diagnosis, lack of system evaluation and the like in the prior art. According to the technical scheme, the method mainly comprises the steps that global element key indexes covering ventilation network, power, monitoring, purification, regulation and control and monitoring systems are defined and collected; customizing a health degree evaluation rule for each index and calculating a score; health state diagnosis is carried out by adopting a multi-level information fusion strategy of an equipment level, a subsystem level and a system level; and finally, the visual display of the health state and the rapid and accurate traceability of unsafe factors are realized. According to the invention, systematic and foresight evaluation of the overall health state of the local ventilation system is realized, the sub-health state can be actively pre-warned, the fault source can be intelligently positioned, and the initiative and accuracy of mine ventilation safety management are significantly improved.

The utility model discloses an underground mine ventilation device which comprises a ventilator, an air outlet pipe is arranged at the top of the front side of the ventilator, an air inlet pipe is arranged on the right side of the ventilator, a filtering piece is arranged at the end of the air inlet pipe and is designed to be of a structure with more than half of a sphere, and a fixing mechanism is arranged between the filtering piece and the air inlet pipe. According to the underground mine ventilation device, the filtering part of the more than half spherical structure is arranged, so that the filtering area is greatly increased, and compared with a traditional filtering part, the filtering efficiency is effectively improved; through the fixing mechanism with the locking ring matched with the positioning ring, the filtering piece can be rapidly mounted or dismounted only by rotating the driving rod, operation is easy and convenient, and the maintenance difficulty and time cost are reduced.

The utility model discloses an underground ventilation device for metal mining, and relates to the technical field of mining ventilation. The device comprises an air inlet pipeline, a ventilation fan, a filter screen and a dust blocking plate are sequentially arranged in the air inlet pipeline, a collecting box is arranged at the bottom of the filter screen, a cleaning mechanism is arranged between the filter screen and the dust blocking plate, a driving belt wheel and a threaded block are sequentially connected to a first screw of the cleaning mechanism, and a driven shaft is rotationally installed on the inner wall of the air inlet pipeline. A driven belt wheel is installed on the driven shaft, a plurality of impact rods are installed on a fixed block connected to the bottom of the driven shaft, and the impact rods impact the impact block when rotating. By means of the mode, the dust blocking plate vibrates, so that dust and solid impurities attached to the dust blocking plate fall off, the phenomenon that the dust blocking plate is blocked is avoided, the ventilation effect of the dust blocking plate is improved, and the breathing efficiency of workers in a mine is guaranteed.

The invention relates to the technical field of coal mine safety, in particular to a comprehensive safety evaluation method for an underground coal mine ventilation system based on network analysis, which comprises the following steps: performing air network calculation on a ventilation network corresponding to a to-be-evaluated mine ventilation system to obtain theoretical parameters of each node of the ventilation network, the theoretical parameters comprising a theoretical wind direction and a theoretical air volume; based on the theoretical wind direction of each node of the ventilation network, constructing a corresponding wind volume directed reachable matrix; calculating the air volume directed reachable matrix through a network analysis method, and determining a plurality of key evaluation areas of the ventilation network; and obtaining actual ventilation quantities corresponding to the plurality of key evaluation areas, and carrying out dynamic evaluation analysis processing on the to-be-evaluated mine ventilation system based on the theoretical ventilation quantities corresponding to the plurality of key evaluation areas. The problems that mine ventilation evaluation is high in cost, low in efficiency and long in consumed time are solved.

The utility model provides an underground coal mine ventilation filtering device, which relates to the field of coal mines, and comprises an induced draft fan and an air gathering cover communicated with the inlet end of the induced draft fan, two groups of filtering plates working alternately are inserted in the air gathering cover in a sliding manner, and one side of the air gathering cover is connected and communicated with a back flushing cover. The filter plate is slidably clamped in the back-blowing cover, the outlet end of the induced draft fan is connected with and penetrates through a back-blowing pipe, and the back-blowing pipe extends into the back-blowing cover. According to the underground coal mine ventilation and filtration device, air is introduced from the interior of the air gathering cover through the induced draft fan and filtered through the filter plates, and impurities such as filtered batting and leaves can be left on the surfaces of the filter plates and alternately enter the interior of the back flushing cover through the two filter plates; and a reverse blowing pipe is introduced through the outlet end of the induced draft fan to perform reverse blowing on the filter plate, so that impurities on the surface of the filter plate can be blown into the dirt storage tank to be collected.

This utility model discloses an analysis device for coal dust adhering materials in underground ventilation fans of coal mines, comprising a horizontal block, a handle fixed to the lower end of the horizontal block, an L-shaped block fixed to the lower end of the horizontal block, a first threaded post fixed to the lower end of the horizontal block, a first internal threaded cylinder threaded onto the side wall of the first threaded post, a mixing box fixed to the side wall of the first internal threaded cylinder, an installation mechanism installed on the upper end of the mixing box, a first drive mechanism disposed inside the horizontal block, a rotating rod fixed to the output end of the first drive mechanism, a third internal threaded cylinder fixed to the end of the rotating rod away from the horizontal block, a second threaded post threaded onto the inner wall of the third internal threaded cylinder, and a first installation cylinder threaded onto the side wall of the second threaded post. This utility model has the advantages of efficient and accurate sampling, integrated sampling and mixing functions, rapid and uniform mixing, pollution prevention, and convenient operation.

The invention discloses a mine compression heat treatment system and method based on compressed air energy storage. The system comprises a ground compressed air energy storage unit and an underground ventilation heat control adjusting unit. The ground compressed air energy storage unit comprises an air compressor, a cooler and an air storage device which are communicated in sequence; the underground ventilation thermal control adjusting unit comprises a shaft air supply pipeline and a pressure adjusting device; an inlet of the shaft air supply pipeline is communicated with an outlet of the air storage device; and the pressure adjusting device is arranged in a pipeline for communicating the inlet of the shaft air supply pipeline with the outlet of the air storage device and is used for adjusting and controlling the pressure of air fed into the shaft air supply pipeline according to actual underground requirements. As a preferable scheme, a compression heat recovery unit can be additionally arranged, so that recovery and reutilization of compression heat are realized, and the working efficiency of the expansion machine and the power generation efficiency of the power generator are improved; refrigeration energy consumption for self-compression heat treatment is eliminated from the source, and integration of the energy storage technology and the mine heat damage treatment technology and collaborative utilization of energy are achieved.

The invention provides an underground ventilation system and method, and belongs to the technical field of underground ventilation equipment, according to the technical scheme, the underground ventilation system comprises an air supply pipeline and a dust removal pipeline, the air supply pipeline and the dust removal pipeline are both laid to the head-on position, and the ends, close to the working face, of the air supply pipeline and the dust removal pipeline are jointly connected with a pipeline switching device; the underground ventilation system further comprises a public air duct, the public air duct is arranged between the head-on position and the working face, one end of the public air duct is fixedly connected with tunneling equipment located on the working face, and the other end of the public air duct is connected with the pipeline switching device. According to the underground ventilation method, the public air duct is controlled to be switched and communicated with the air supply pipeline or the dust removal pipeline through the pipeline switching device. The method has the beneficial effects that the discontinuous tunneling scene can be accurately adapted, and invalid energy consumption is effectively reduced.

The utility model relates to the technical field of underground ventilation, in particular to a resistance reducing and efficiency improving device of an underground ventilation system. According to the technical scheme, the device comprises a second ventilation pipe, a first ventilation pipe and a limiting frame, and air outlet pipes are fixedly embedded into the bottom end faces of the second ventilation pipe and the first ventilation pipe; a first T-shaped fixing frame and a second T-shaped fixing frame are welded to the bottom end face of the limiting frame, and screws are installed in the limiting frame. Sliding groove plates are installed at the two ends of the inner wall of the first ventilation pipe correspondingly, and filter screens are slidably connected into the sliding groove plates in a sleeved mode. A spray head is arranged in the air outlet pipe through a fixed pipe; driving motors are mounted in the second ventilation pipe and the first ventilation pipe through mounting frames correspondingly, and fan blades are arranged on output shafts of the driving motors. Cooling fins are installed on the driving motor, and coil pipes are installed in the cooling fins. According to the utility model, underground ventilation is satisfied, intake air can be pretreated during ventilation, and cooling can be carried out during long-time operation.

The application discloses an underground ventilation device for rapidly reducing carbon monoxide concentration in a mine, which comprises a base structure as a mobile support, a swing structure for left-right stress movement of air conveying and filtering structure arranged on the base structure, the base structure comprises a base plate provided with mounting grooves at the bottom, and movable wheels for moving the whole structure to different working places are symmetrically arranged at the bottom of the base plate, the movable wheels are connected with first hydraulic telescopic cylinders for up-down adjustment of a stress plate through the base plate, a plurality of ground nails for supporting and limiting are arranged on the bottom of the stress plate, the base structure comprises a base plate provided with mounting grooves at the bottom, and a limiting plate for connecting and limiting the swing structure is arranged on one side of the upper portion of the base plate, and a counterweight for keeping the whole device balanced and stable is arranged on the limiting plate, the underground ventilation device for rapidly reducing carbon monoxide concentration in a mine has the stress adjusting and ground inserting limiting effects through the ground nails.

The invention relates to the technical field of coal mine underground ventilation, in particular to a coal mine ventilator with a fan blade deflection structure, which comprises an air duct, a plurality of fan blades arranged in the air duct, a motor and a deflection assembly. The deflection assembly comprises a cylinder body and an adjusting cylinder which are coaxially arranged in a sleeved mode from inside to outside, and the adjusting cylinder can be connected to the outer surface of the cylinder body in a sliding mode in the axial direction. The barrel is fixedly connected with the output end of the motor. The bottom of each fan blade comprises a first end and a second end, the first ends are rotationally connected to the barrel, and the second ends are slidably connected to the adjusting barrel in the transverse direction. When the adjusting cylinder slides in the axial direction relative to the cylinder body, the adjusting cylinder drives the second ends of the fan blades to move in the axial direction relative to the cylinder body, the second ends slide in the transverse direction relative to the adjusting cylinder, the first ends rotate relative to the cylinder body, and therefore the deflection angle of the fan blades is adjusted. The coal mine ventilator is simple in structure and convenient to operate, and the angles of the fan blades can be flexibly adjusted according to actual requirements in the actual use process so as to meet various ventilation requirements.

This invention relates to the field of coal mining, and particularly to the field of underground ventilation in coal mines, specifically a method for constructing return air channels in coal mine tunneling roadways. The method includes: constructing chambers within the tunneling roadway; sealing the working face using anchor bolts, mesh support, or pillar and mesh support; drilling holes in the roadway side near the return airway of the mining area to connect with the return airway, forming ventilation holes; injecting casing into the ventilation holes; and installing pneumatic fans to increase airflow, thus quickly constructing a return air system and facilitating mine connection. This invention involves minimal engineering work, is safe and efficient, easy to operate, and cost-effective. It also enables the rapid construction of a return air system. After a full-pressure ventilation system is established at the working face, the drill holes can be temporarily sealed or permanently sealed using materials such as mud or cement.

1. The name of the design product: mine air door. 2. The use of the design product: for mine ventilation, and personnel and equipment access. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1.

This invention discloses a mining path optimization method and system incorporating geological data, belonging to the field of path optimization technology. A mining path optimization system incorporating geological data includes a geological data modeling module and a mining path optimization module. This invention introduces the mining heat hazard mechanism into the path planning process, and by constructing mining environmental load data and an environmental saturation model, it achieves a quantitative assessment of the risks of high temperature, high humidity, and pollutant accumulation, avoiding the heat hazard hazards caused by traditional path planning neglecting environmental safety factors. Based on real-time geological monitoring data and roadway topology, it dynamically calculates the heat and moisture exchange capacity and pollutant dilution capacity of roadway nodes, enabling the path planning results to accurately reflect changes in underground ventilation and environmental conditions, thus improving the accuracy of planning decisions.

The utility model relates to the field of underground ventilation devices, and discloses a coal mine underground ventilation cleaning device which comprises a ventilation pipe, the right side of the ventilation pipe is fixedly connected with a connecting pipe, a through groove is formed between the ventilation pipe and the connecting pipe, the bottom side of the ventilation pipe is provided with a collecting assembly, and the collecting assembly is connected with the connecting pipe. A reciprocating lead screw is rotationally connected to the bottom side of the interior of the connecting pipe, and the outer wall of the reciprocating lead screw is sleeved with a sliding sleeve. According to the utility model, the reciprocating screw rod can be driven to rotate by starting the motor, so that the sliding sleeve drives the movable ring and the one-way valve diaphragm to move up and down, and when the sliding sleeve moves downwards, the inclined plane connecting block is in contact with the double-inclined-plane telescopic block, retracts into the sliding groove and drives the valve seat to rotate; the effect of quickly opening the one-way valve diaphragm is achieved, so that the one-way valve diaphragm can be quickly opened through the inclined plane connecting block when the moving ring moves downwards, and the ventilation efficiency of the device is improved.

The present application belongs to the technical field of mine ventilation control, and particularly relates to a mine intelligent ventilation control method and system, comprising the following steps: S1. Data sensing and fusion: through a multi-protocol data gateway, multi-source heterogeneous data from ventilation facilities, environmental sensors and personnel positioning systems is collected to generate a standardized data stream; S2. Digital twin construction and updating: based on the standardized data stream, a digital twin of the mine ventilation system is driven to be constructed; S3. Intelligent deduction and decision-making; S4. Strategy execution and closed-loop control; S5. Edge autonomy. Through the multi-protocol data gateway, heterogeneous data is integrated and a standardized data stream is generated, providing a unified and high-quality data basis for subsequent analysis and solving the information island problem. Based on real-time and feedback data, the digital twin is dynamically calibrated, which significantly improves the simulation accuracy and makes it more realistic to reflect the underground ventilation conditions.

The application discloses a kind of coal mine underground ventilation air volume determination method, system, equipment and medium, it is related to coal mine ventilation management technical field, the present application is when looking for minimum loop, with the level of tree node in breadth-first spanning tree as weight factor, determine each branch priority weight, start searching and build multiple loops from the weight minimum branch, extract the closed loop of least branch quantity;Simultaneously according to the number of branch, set dynamic weight, select the minimum of the sum of branch weight in loop as minimum loop, ensure that the roadway air volume calculated is consistent with actual value.In addition, the direction of air flow is determined by edge relationship, the sign of air volume is adjusted and the abnormal direction is corrected, so that the calculated direction of air flow is consistent with actual value.