Axial flow fan for mine

Abstract

The axial flow fan comprises a cyclone dust removal conical shell and a third electric telescopic rod, a dust removal end cover is fixed to the outer wall of the top of the cyclone dust removal conical shell through bolts, the inner wall of one side of the middle of the cyclone dust removal conical shell communicates with an air inlet pipeline, and a dust exhaust pipe is welded to the center of the bottom of the cyclone dust removal conical shell in a penetrating mode. Gas detection is accurate and comprehensive, purification is long-acting and efficient, the defects that existing equipment is single in detection, incomplete in purification and prone to poisoning due to catalysis are overcome, the first gas detection module and the second gas detection module both adopt multi-parameter integrated sensor arrays, gas, carbon monoxide, hydrogen sulfide and humidity sensors are integrated, and the detection accuracy is improved. High-speed signal transmission is achieved through a CAN bus and a microcontroller, gas composition and concentration changes can be accurately monitored in real time, it is ensured that no harmful gas is missed and purified, and a glass fiber filter membrane, a porous silica gel adsorption column and an activated carbon adsorption net cage in a second rectangular flow guide pipe form a three-stage pretreatment structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan, in particular to an axial flow fan for mine. BACKGROUND

[0002] As the core key equipment of underground ventilation and gas management, the mine axial flow fan is widely used in underground mining scenes such as coal mines and metal mines. Its core function is to realize the forced convection exchange of underground air. On the one hand, it transports fresh air to the working area to meet the breathing needs of miners and the heat dissipation requirements of equipment. On the other hand, it timely discharges various harmful gases (such as gas, carbon monoxide, hydrogen sulfide, etc.) and dust pollutants generated in the underground mining process to ensure that the underground working environment meets the safety standards and avoids safety accidents and occupational health risks such as poisoning, explosion, and pneumoconiosis. The underground working environment has the characteristics of high humidity, high dust, complex harmful gas composition, and large concentration fluctuation, which puts strict requirements on the comprehensive performance of the axial flow fan. It not only needs to have stable ventilation capacity, but also needs to integrate efficient dust removal, gas purification, real-time monitoring, and other functions in one. The traditional mine axial flow fan mostly adopts a single ventilation structure and can only realize basic air delivery. With the increase of mining depth and the improvement of mining intensity, the amount of harmful gases and dust generated in the mine increases significantly. The single-function fan can no longer meet the safety management needs of modern mines. Therefore, it is urgent to develop efficient axial flow fans with composite purification function and intelligent control ability to adapt to complex underground working environment.

[0003] However, the existing mine axial flow fan has many shortcomings in actual use, which seriously affects the ventilation safety and management effect.

[0004] Firstly, the dust removal system is inefficient and easy to block. The dust removal structure of the existing equipment is mostly single filter screen filtering, and lacks multi-stage dust removal design. Underground high-concentration dust not only contains large-particle rock dust, but also contains a large amount of fine dust and sticky dust. Single filtering mode cannot achieve comprehensive interception, and part of the fine dust will penetrate the filter screen into the subsequent ventilation pipeline, which will cause pipeline blockage and reduce ventilation efficiency after long-term accumulation. At the same time, the filter screen lacks effective cleaning auxiliary structure, and needs to be disassembled and cleaned after blocking, which seriously affects the continuity of mine ventilation and increases the risk of work interruption.

[0005] Secondly, the harmful gas detection and purification lacks accuracy and long-term effectiveness. The existing equipment either is not equipped with real-time gas detection device, which cannot timely sense the change of harmful gas concentration in the well, or has single detection parameter, which can only monitor a few gases such as gas, and is difficult to comprehensively cover a variety of toxic and harmful gases such as carbon monoxide and hydrogen sulfide, which is easy to cause the risk of missed detection. In terms of purification treatment, single adsorption or catalytic method is mostly used, the single catalytic coating composition is not strong in pertinence to different harmful gases, the purification efficiency is low, and the catalytic coating is easy to be affected by hydrogen sulfide and other gases to cause sulfur poisoning, which leads to rapid decay of catalytic performance, frequent replacement is needed, which not only increases the use cost, but also increases the maintenance workload and downtime.

[0006] Thirdly, the gas flow rate is not flexible and the exhaust safety is insufficient. When the underground gas passes through multi-stage filtration and purification treatment, the pipeline resistance will increase significantly. The fan blade structure of the existing fan is fixed, and the suction force and flow rate cannot be adjusted according to the change of resistance, which leads to the decrease of gas conveying efficiency, and even the ventilation is not smooth. At the same time, heat is generated in the catalytic purification process, which makes the exhaust gas temperature rise. If it is directly discharged, it may cause abnormal temperature in the well, and there is lack of effective cooling structure. SUMMARY

[0007] The purpose of the present application is to solve the problems existing in the prior art and provide an axial flow fan for mine.

[0008] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: An axial flow fan for mine, comprising a cyclone dust removal cone shell and a third electric telescopic rod, the top outer wall of the cyclone dust removal cone shell is fixed with a dust removal end cover through bolts, and the middle side inner wall of the cyclone dust removal cone shell is communicated with an air inlet pipeline, the bottom center of the cyclone dust removal cone shell is penetrated and welded with a dust removal pipe, and the bottom of the dust removal pipe is sealingly connected with an electric control valve, the top axial position of the dust removal end cover is connected with an exhaust pipeline, and the exhaust pipeline is threadedly connected with a conical filter screen on one side of the inner wall of the dust removal end cover, the top of the exhaust pipeline is fixed with a connecting cover through bolts, and one side of the connecting cover is fixedly connected with a rectangular air inlet pipe through bolts; The inner wall of one side of the rectangular air inlet pipe is communicated with a first rectangular flow guide pipe, and the inner wall of the other side of the rectangular air inlet pipe is communicated with a second rectangular flow guide pipe, the inner wall of one side of the bottom of the rectangular air inlet pipe penetrates along the width direction and is provided with a sliding groove, the inner wall of the sliding groove is slidably connected with a sliding block, the outer wall of the bottom of the sliding block is welded with a rectangular sealing baffle, the outer wall of one side of the bottom of the sliding block is fixed with a first electric telescopic rod through screws, the inner wall of the top of the rectangular air inlet pipe is penetratively connected with a drainage air pipe, and the inner wall of one end of the drainage air pipe located in the inner wall of the rectangular air inlet pipe is welded with a cone-shaped gas collecting cover, the end of the drainage air pipe away from the cone-shaped gas collecting cover is communicated with a cylindrical protective shell, the inner wall of the cylindrical protective shell is provided with a first gas detection module, the outer wall of one side of the cylindrical protective shell is provided with an amplification circuit module, the amplification circuit module is respectively connected with a signal conditioning chip and a microcontroller through signal lines, the inner wall of one side of the cylindrical protective shell is communicated with a gas guide pipe, and the tail end of the gas guide pipe is inserted into the second rectangular flow guide pipe; The top of one side of the second rectangular flow guide pipe penetrates and is provided with a first rectangular through slot, the top of the first rectangular through slot is fixed with a first rectangular cover plate through bolts, the outer wall of the bottom of the first rectangular cover plate is fixed with a glass fiber filter membrane through screws, one side of the glass fiber filter membrane is provided with two rows of porous silica gel adsorption columns which are equidistantly distributed, one side of the porous silica gel adsorption column is fixedly provided with an activated carbon adsorption net box, the inner wall of the bottom of the second rectangular flow guide pipe is fixedly welded with a U-shaped tray below the glass fiber filter membrane and the activated carbon adsorption net box, the outer wall of the other end of the top of the second rectangular flow guide pipe penetrates and is provided with a second rectangular through slot, the top of the second rectangular through slot is fixed with a second rectangular cover plate through bolts, the outer wall of the bottom of the second rectangular cover plate is welded with three equidistantly distributed lateral sealing baffles, the outer wall of one side of the lateral sealing baffle is fixed with symmetrically distributed L-shaped brackets through screws, three groups of L-shaped brackets are sequentially and fixedly connected with a first honeycomb ceramic, a second honeycomb ceramic and a third honeycomb ceramic, the outer wall of the first honeycomb ceramic is coated with a first main catalytic coating, the outer wall of the second honeycomb ceramic is coated with a second main catalytic coating, the outer wall of the third honeycomb ceramic is coated with a catalytic coating, and mounting brackets are arranged between the three groups of lateral sealing baffles, the mounting brackets are fixedly provided with equidistantly distributed electric heating rods, one side of the mounting bracket is provided with a temperature sensor, the outer wall of the tail end of the first rectangular flow guide pipe and the second rectangular flow guide pipe is welded with a rectangular gas collecting cover, and the side of the rectangular gas collecting cover is fixed with an axial flow shell through bolts, the inner wall of the bottom of the rectangular gas collecting cover is provided with a second gas detection module; The inner wall of the axial flow shell is provided with a fixed support by screwing, and a rotating sleeve is rotatably installed at the center of the fixed support by a bearing, a first axial flow vane is welded to the outer wall of one side of the rotating sleeve, and a first helical gear is welded to the outer wall of the other side of the rotating sleeve, the first helical gear is vertically engaged with a second helical gear on one side, and the shaft of the second helical gear is fixed with a driving shaft by screwing, the driving shaft is connected with a servo motor through a shaft coupling, and a rotating shaft is inserted and installed in the inner wall of the rotating sleeve, a second axial flow vane is welded to the outer wall of one side of the rotating shaft, and a third helical gear is welded to the outer wall of the middle of the rotating shaft, and the outer wall of the other end of the rotating shaft is rotatably installed on the fixed bottom plate by a bearing. The end of the axial flow shell is fixed with an exhaust guide shell by bolts, the inner wall of the exhaust guide shell is rotatably installed with equidistantly distributed cooling guide shells, and the outer wall of one side of the cooling guide shell is rotatably installed with a water inlet pipe through a sealing bearing, and the outer wall of the other side of the cooling guide shell is rotatably installed with a drain pipe through a sealing bearing.

[0009] Preferably, the first gas detection module and the second gas detection module are multi-parameter integrated gas sensor arrays, and the gas sensor array is composed of a gas sensor, a carbon monoxide sensor, a hydrogen sulfide sensor and a humidity sensor, and the first gas detection module and the second gas detection module are connected with the microcontroller by CAN bus.

[0010] Preferably, the first main catalytic coating is a Pt-Pd alloy catalytic oxidation coating, and the mass ratio of Pt to Pd is 1:1 to 3:1, and the coating thickness is 50-80 μm, which is used for synergistic catalysis of gas and CO oxidation reaction, and the second main catalytic coating is -CuO composite oxide selective catalytic coating, and The molar ratio of CuO is 6:4 to 7:3, and the coating thickness is 40-60 μm, which is used for selective catalytic oxidation conversion reaction of H2S, and the auxiliary catalytic coating is CeO2-ZrO2 composite oxide oxygen storage type auxiliary catalytic coating, and the molar ratio of CeO2 to ZrO2 is 7:3 to 8:2, and the coating thickness is 30-50 μm, which is used for storing and dynamically releasing oxygen, while inhibiting sulfur poisoning of the first main catalytic coating and the second main catalytic coating, and synergistically improving the catalytic purification efficiency of the three gases.

[0011] Preferably, the dust removal end cover is provided with equidistantly distributed spray heads on the inner wall around the conical filter screen, and the same annular water pipe is threadedly connected to the end of the spray head, and the annular water pipe is in communication with the drain pipe through the water pipe.

[0012] Preferably, both ends of the sliding block are provided with limiting insertion holes, and the inner walls of the limiting insertion holes are slidably connected with limiting guide columns, the sliding block is slidably connected with the limiting guide columns, the sizes of the pipe openings of the first and second rectangular flow guide pipes are suitable for the size of the rectangular sealing baffle, and the first and second rectangular flow guide pipes are connected with the rectangular sealing baffle.

[0013] Preferably, the bottom side of the first and second honeycomb ceramics is welded with a flow guide baffle in an inclined direction, the bottom of the flow guide baffle is located in the inner wall of the second rectangular flow guide pipe, a rectangular collecting groove is formed in the inner wall of the bottom of the second rectangular flow guide pipe in a width direction, and a sulfur powder collecting shell is connected with the inner wall of the bottom of the rectangular collecting groove.

[0014] Preferably, the outer walls of both sides of the fixed bottom plate are welded with guide sliding rods, the guide sliding rods are slidably connected with the inner walls of guide rails, the outer wall of one side of the guide sliding rod is fixedly connected with a second electric telescopic rod through a screw, and the two guide rails are distributed in parallel along the axis of the axial flow shell.

[0015] Preferably, the outer walls of both sides of the bottom of the cooling flow guide shell are welded with limiting clamping plates in a width direction, the inner walls of the limiting clamping plates are slidably connected with limiting guide columns, a plurality of limiting guide columns are welded with the outer wall of one side of a rectangular connecting plate, and the outer wall of one side of the rectangular connecting plate is fixedly connected with a third electric telescopic rod through a screw.

[0016] Preferably, the sizes of the fan blades of the first and second axial flow fan blades are the same, the inclination directions of the blades of the first and second axial flow fan blades are opposite, and the attack angle of the first axial flow fan blade is smaller than that of the second axial flow fan blade.

[0017] Preferably, the outer wall of one side of the second rectangular flow guide pipe is fixedly connected with a PLC controller through a screw, the PLC controller is electrically connected with the electric control valve, the first electric telescopic rod, the first gas detection module, the amplification circuit module, the signal conditioning chip, the microcontroller, the electric heating rod, the temperature sensor, the second gas detection module, the servo motor, the second electric telescopic rod and the third electric telescopic rod through signal lines, and the PLC controller is connected with an external power supply through a lead wire.

[0018] The beneficial effects of the present application are as follows: 1. This invention constructs a multi-stage dust removal system combining cyclone dust collection and filtration cleaning. The cyclone dust collection cone utilizes the principle of centrifugal force to quickly separate a large number of large dust particles in the gas and allow them to settle into the dust discharge pipe. With the help of an electrically controlled valve controlled by a PLC controller, dust can be automatically discharged periodically, preventing dust from accumulating inside the cone and affecting dust removal efficiency. The conical filter screen inside the dust collection end cover further intercepts fine dust, ensuring a significant reduction in the dust content of the gas entering subsequent pipelines. At the same time, the spray heads distributed around the conical filter screen are connected to the drain pipe through a ring water pipe. Under the control of the PLC controller, the filter screen can be sprayed and cleaned periodically, promptly washing away the sticky dust and fine particles adhering to the surface. The cleaning operation can be completed without stopping the machine for disassembly, ensuring the long-term stable operation of the dust removal system and significantly improving ventilation continuity.

[0019] 2. This design offers precise and comprehensive gas detection with long-lasting and efficient purification, successfully overcoming the shortcomings of existing equipment such as single detection, incomplete purification, and susceptibility to catalytic poisoning. Both the first and second gas detection modules employ multi-parameter integrated sensor arrays, integrating sensors for methane, carbon monoxide, hydrogen sulfide, and humidity. High-speed signal transmission is achieved via a CAN bus and microcontroller, enabling real-time and accurate monitoring of gas composition and concentration changes, ensuring no harmful gases are missed. In the purification stage, the glass fiber filter membrane, porous silica gel adsorption column, and activated carbon adsorption mesh box within the second rectangular guide tube form a three-stage pretreatment structure. This first filters out minute impurities, then adsorbs moisture and organic odors, creating a dry and clean environment for subsequent catalytic reactions. Three layers of honeycomb ceramic are coated with targeted catalytic coatings. The first main catalytic coating efficiently and synergistically catalyzes the oxidation of methane and CO, while the second main catalytic coating selectively converts H2S, helping the catalytic coating dynamically store and release oxygen, while effectively inhibiting sulfur poisoning of the first two catalytic coatings. Combined with precise temperature control via electric heating rods and temperature sensors, this not only significantly improves the purification efficiency of the three harmful gases but also significantly extends the service life of the catalytic coatings, reducing maintenance costs and replacement frequency.

[0020] 3. This invention adopts a dual-axial flow fan blade structure with counter-rotating blades. The first and second axial flow fan blades have the same diameter, opposite tilt directions, and a reasonable difference in angle of attack. When the servo motor drives the rotating sleeve and rotating shaft to rotate synchronously through the helical gear transmission mechanism, the airflow generated by the two sets of fan blades forms a superposition effect, which can generate a strong adsorption force and effectively overcome the pipeline resistance caused by multi-stage filtration and purification. At the same time, the second electric telescopic rod drives the fixed base plate to move flexibly through the guide slide and guide rail, which can quickly realize the meshing drive of the second axial flow fan blades, thereby realizing the flexible change between dual-fan blade drive and single-fan blade drive, realizing the on-demand control of gas flow rate, and ensuring that the gas can maintain a stable delivery efficiency regardless of whether the gas has undergone multi-stage purification treatment, avoiding the situation where poor ventilation or excessive flow rate leads to insufficient purification.

[0021] 4、The design runs intelligently, stably and safely, comprehensively solves the problems of insufficient safety of existing equipment and secondary pollution, the equipment adopts a PLC controller to realize full-process automatic control, through signal lines, electric control valves, various electric telescopic rods, gas detection modules, microcontrollers, electric heating rods, temperature sensors, servo motors and other core components, the switching of the flow guide pipe, the adjustment of the heating temperature, the speed regulation of the fan blade and the adjustment of the cooling structure can be automatically completed according to the gas detection data and the temperature data, the manual intervention is greatly reduced, the operation stability and reliability are improved, the cooling guide shell in the exhaust guide shell is connected with cold water through the water inlet pipe, and efficient heat exchange is carried out with the purified high-temperature gas, so that the gas temperature is quickly reduced and discharged from the drain pipe, the abnormal temperature of the underground caused by the high-temperature gas emission is avoided, and the safety hazard is eliminated, in addition, the sulfur powder generated by the catalytic reaction is accurately guided to the sulfur powder collecting shell through the flow guide baffle, the secondary pollution caused by the diffusion of the sulfur powder is effectively prevented, and the safety and cleanliness of the underground operation environment are comprehensively guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is an overall structure front view of an axial flow fan for a mine shaft proposed in the application; Figure 2 It is an overall structure side view of an axial flow fan for a mine shaft proposed in the application; Figure 3 It is an overall three-dimensional structure schematic diagram of an axial flow fan for a mine shaft proposed in the application; Figure 4 It is a dust removal cone shell split structure schematic diagram of an axial flow fan for a mine shaft proposed in the application; Figure 5 It is a dust removal end cover structure bottom view of an axial flow fan for a mine shaft proposed in the application; Figure 6 It is a first perspective structure schematic diagram of an axial flow fan for a mine shaft proposed in the application; Figure 7 It is a rectangular flow guide pipe structure bottom view of an axial flow fan for a mine shaft proposed in the application; Figure 8 It is a second rectangular flow guide pipe internal split structure side view of an axial flow fan for a mine shaft proposed in the application; Figure 9 It is a second rectangular flow guide pipe split structure top view of an axial flow fan for a mine shaft proposed in the application; Figure 10 It is a second perspective structure schematic diagram of an axial flow fan for a mine shaft proposed in the application; Figure 11 It is an axial flow shell structure side view of an axial flow fan for a mine shaft proposed in the application; Figure 12 A schematic diagram of an axial flow shell structure of an axial flow fan for a mine well is proposed for the present application; Figure 13 A schematic diagram of an exhaust guide shell structure of an axial flow fan for a mine well is proposed for the present application; Figure 14 A side view of the internal structure of an axial flow shell of an axial flow fan for a mine well is proposed for the present application.

[0023] In the figure: 1, cyclone dust removal cone shell; 2, dust removal end cover; 3, air inlet pipe; 4, dust removal pipe; 5, electric control valve; 6, exhaust pipe; 7, conical filter screen; 8, spray head; 9, annular water pipe; 10, connecting cover shell; 11, rectangular air inlet pipe; 12, first rectangular guide pipe; 13, second rectangular guide pipe; 14, sliding groove; 15, sliding block; 16, rectangular sealing baffle; 17, first electric telescopic rod; 18, limiting insertion hole; 19, limiting guide column; 20, drainage air pipe; 21, cylindrical protective shell; 22, conical gas gathering cover; 23, first gas detection module; 24, amplification circuit module; 25, signal conditioning chip; 26, microcontroller; 27, air guide pipe; 28, first rectangular through slot; 29, first rectangular cover plate; 30, glass fiber filter membrane; 31, porous silica gel adsorption column; 32, activated carbon adsorption net box; 33, U-shaped tray; 34, second rectangular through slot; 35, second rectangular cover plate; 36, lateral sealing baffle; 37, L-shaped bracket; 38, first honeycomb ceramic; 39, second honeycomb ceramic; 40, third honeycomb ceramic; 41, first main catalytic coating; 42, second main catalytic coating; 43, auxiliary catalytic coating; 44, mounting bracket; 45, electric heating rod; 46, temperature sensor; 47, flow guide baffle; 48, sulfur powder collection shell; 49, rectangular gas gathering cover; 50, axial flow shell; 51, second gas detection module; 52, fixing bracket; 53, rotating sleeve; 54, first axial flow fan blade; 55, first helical gear; 56, second helical gear; 57, drive shaft; 58, servo motor; 59, rotating shaft; 60, second axial flow fan blade; 61, third helical gear; 62, fixed base plate; 63, guide slide rod; 64, guide rail; 65, second electric telescopic rod; 66, exhaust guide shell; 67, cooling flow guide shell; 68, water inlet pipe; 69, water outlet pipe; 70, limiting clamping plate; 71, limiting guide column; 72, rectangular connecting plate; 73, third electric telescopic rod; 74, PLC controller. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0025] Embodiment 1, refer to Figures 1-14The utility model provides a kind of axial flow fan for mine, including cyclone dust cone shell 1 and third electric telescopic rod 73, the top outer wall of the cyclone dust cone shell 1 is fixed with dust end cover 2 by bolt, and the middle part one side inner wall of cyclone dust cone shell 1 is communicated with air inlet pipeline 3, the bottom center of the cyclone dust cone shell 1 is welded with dust exhaust pipe 4, and dust exhaust pipe 4 bottom is sealingly connected with electric control valve 5, the top axial position of the dust end cover 2 is connected with exhaust duct 6, and exhaust duct 6 is located dust end cover 2 inner wall one side and is connected with conical filter screen 7 by screw thread, the top of exhaust duct 6 is fixed with connecting cover shell 10 by bolt, and one side of connecting cover shell 10 is fixedly connected with rectangular air inlet pipe 11 by bolt; The inner wall of one side of the rectangular air inlet pipe 11 is communicated with first rectangular flow guide pipe 12, and the inner wall of other side of rectangular air inlet pipe 11 is communicated with second rectangular flow guide pipe 13, the inner wall of one side of bottom of rectangular air inlet pipe 11 is opened along width direction and is penetrated with sliding groove 14, and the inner wall of sliding groove 14 is slidably inserted with sliding block 15, the outer wall of bottom of sliding block 15 is welded with rectangular sealing baffle 16, and the outer wall of one side of bottom of sliding block 15 is fixed with first electric telescopic rod 17 by screw, the inner wall of top of rectangular air inlet pipe 11 is penetrated and is connected with drainage air pipe 20, and the inner wall one end of drainage air pipe 20 located rectangular air inlet pipe 11 is welded with conical frustum gas gathering cover 22, the end of drainage air pipe 20 away from conical frustum gas gathering cover 22 is communicated with cylindrical protective shell 21, and first gas detection module 23 is installed in the inner wall of cylindrical protective shell 21, the outer wall of one side of cylindrical protective shell 21 is provided with amplification circuit module 24, and amplification circuit module 24 is connected with signal conditioning chip 25 and microcontroller 26 respectively by signal line, the inner wall of one side of cylindrical protective shell 21 is communicated with air guide pipe 27, and air guide pipe 27 is inserted inside second rectangular flow guide pipe 13 at the end; A first rectangular through-slot 28 is formed through the outer wall of one side of the top of the second rectangular guide tube 13. A first rectangular cover plate 29 is fixed to the top of the first rectangular through-slot 28 by bolts. A glass fiber filter membrane 30 is fixed to the bottom outer wall of the first rectangular cover plate 29 by screws. Two rows of porous silica gel adsorption columns 31 are provided on one side of the glass fiber filter membrane 30. An activated carbon adsorption mesh box 32 is fixedly installed on one side of the porous silica gel adsorption columns 31. A U-shaped tray 33 is welded and fixed to the bottom inner wall of the second rectangular guide tube 13 directly below the glass fiber filter membrane 30 and the activated carbon adsorption mesh box 32. A second rectangular through-slot 34 is formed through the outer wall of the other top end of the second rectangular guide tube 13. A second rectangular cover plate 35 is fixed to the top of the second rectangular through-slot 34 by bolts. Three lateral sealing baffles 36 are welded to the bottom outer wall of the second rectangular cover plate 35. The outer wall is fixed with symmetrically distributed L-shaped brackets 37 by screws. The three sets of L-shaped brackets 37 are sequentially snapped together with a first honeycomb ceramic 38, a second honeycomb ceramic 39, and a third honeycomb ceramic 40. The outer wall of the first honeycomb ceramic 38 is coated with a first main catalytic coating 41, the outer wall of the second honeycomb ceramic 39 is coated with a second main catalytic coating 42, and the outer wall of the third honeycomb ceramic 40 is coated with a co-catalytic coating 43. A mounting bracket 44 is provided between the three sets of lateral sealing baffles 36. Electric heating rods 45 are fixed on the mounting bracket 44 at equal intervals. A temperature sensor 46 is provided on one side of the mounting bracket 44. A rectangular gas gathering hood 49 is welded to the outer wall of the end of the first rectangular guide tube 12 and the second rectangular guide tube 13. An axial flow shell 50 is fixed to one side of the rectangular gas gathering hood 49 by bolts. A second gas detection module 51 is installed on the bottom inner wall of the rectangular gas gathering hood 49. The inner wall of the axial flow housing 50 is fitted with a fixed bracket 52 by screws, and a rotating sleeve 53 is rotatably mounted at the center of the fixed bracket 52 by a bearing. A first axial flow fan blade 54 is welded and fixed to one side of the outer wall of the rotating sleeve 53, and a first helical gear 55 is welded and fixed to the other side of the outer wall of the rotating sleeve 53. A second helical gear 56 is vertically meshed on one side of the first helical gear 55, and a drive shaft 57 is fixed to the axis of the second helical gear 56 by screws. The drive shaft 57 is connected to a servo motor 58 through a coupling, and a rotating shaft 59 is inserted and installed on the inner wall of the rotating sleeve 53. A second axial flow fan blade 60 is welded to one side of the outer wall of the rotating shaft 59, and a third helical gear 61 is welded to the middle outer wall of the rotating shaft 59. The other end of the outer wall of the rotating shaft 59 is rotatably mounted on a fixed base plate 62 by a bearing. The end of the axial flow shell 50 is fixed with an exhaust guide shell 66 by bolts, the inner wall of the exhaust guide shell 66 is rotatably installed with equidistantly distributed cooling guide shells 67, and the outer wall of one side of the cooling guide shell 67 is rotatably installed with a water inlet pipe 68 through a sealing bearing, and the outer wall of the other side of the cooling guide shell 67 is rotatably installed with a water outlet pipe 69 through a sealing bearing; The first gas detection module 23 and the second gas detection module 51 are multi-parameter integrated gas sensor arrays, and the gas sensor array is composed of a gas sensor, a carbon monoxide sensor, a hydrogen sulfide sensor and a humidity sensor, and the first gas detection module 23 and the second gas detection module 51 are signal connected with the microcontroller 26 through a CAN bus; The first main catalytic coating 41 is a Pt-Pd alloy catalytic oxidation coating, and the mass ratio of Pt to Pd is 1:1-3:1, and the coating thickness is 50-80 μm, which is used for synergistically catalyzing the oxidation reaction of gas and CO, and the second main catalytic coating 42 is a -CuO composite oxide selective catalytic coating, and The molar ratio of CuO is 6:4-7:3, and the coating thickness is 40-60 μm, which is used for selectively catalyzing the oxidation conversion reaction of H2S, and the auxiliary catalytic coating 43 is a CeO2-ZrO2 composite oxide oxygen storage type auxiliary catalytic coating, and the molar ratio of CeO2 to ZrO2 is 7:3-8:2, and the coating thickness is 30-50 μm, which is used for storing and dynamically releasing oxygen, while inhibiting the sulfur poisoning of the first main catalytic coating 41 and the second main catalytic coating 42, and synergistically improving the catalytic purification efficiency of the three gases; The dust removal end cover 2 is installed with equidistantly distributed spray heads 8 on the inner wall around the conical filter screen 7, and the same annular water pipe 9 is threadedly connected to the end of the spray head 8, the annular water pipe 9 is in communication with the water outlet pipe 69 through a water pipe, the two ends of the sliding block 15 are penetrated to form a limiting insertion hole 18, and the inner wall of the limiting insertion hole 18 is slidably inserted into a limiting guide column 19, the sliding block 15 and the limiting guide column 19 form a sliding fit, and the pipe opening size of the first rectangular guide pipe 12 and the second rectangular guide pipe 13 is adapted to the size of the rectangular sealing baffle 16, and the first rectangular guide pipe 12 and the second rectangular guide pipe 13 form an insertion fit with the rectangular sealing baffle 16; The bottom side of the first honeycomb ceramic 38 and the second honeycomb ceramic 39 is welded and fixed with a flow guide baffle 47 in an inclined direction, and the bottom of the flow guide baffle 47 is penetrated in the width direction to form a rectangular collecting groove in the inner wall of the second rectangular guide pipe 13, and the bottom inner wall of the rectangular collecting groove is clamped and fixed with a sulfur powder collecting shell 48; Both sides of the fixed bottom plate 62 are welded with guide sliding rods 63, which are slidingly inserted into the inner wall of the guide rail 64, and the outer wall of one side of the guide sliding rod 63 is fixedly connected with the second electric telescopic rod 65 through screws, and the two guide rails 64 are distributed along the axis of the axial flow shell 50 in parallel; The bottom of the cooling guide shell 67 is welded with a limiting clamping plate 70 on both sides of the outer wall in the width direction, and the inner wall of the limiting clamping plate 70 is slidingly inserted into the limiting guide column 71, a plurality of limiting guide columns 71 are welded and fixed on one side of the outer wall of the rectangular connecting plate 72, and the third electric telescopic rod 73 is fixed on one side of the outer wall of the rectangular connecting plate 72 through screws, the fan blade diameter of the first axial flow fan blade 54 and the fan blade diameter of the second axial flow fan blade 60 are the same, and the blade inclination direction of the first axial flow fan blade 54 is opposite to the blade inclination direction of the second axial flow fan blade 60, and the attack angle of the first axial flow fan blade 54 is smaller than the attack angle of the second axial flow fan blade 60; The outer wall of one side of the second rectangular guide pipe 13 is fixed with a PLC controller 74 through screws, and the PLC controller 74 is electrically connected with the electric control valve 5, the first electric telescopic rod 17, the first gas detection module 23, the amplification circuit module 24, the signal conditioning chip 25, the microcontroller 26, the electric heating rod 45, the temperature sensor 46, the second gas detection module 51, the servo motor 58, the second electric telescopic rod 65 and the third electric telescopic rod 73 through signal lines, and the PLC controller 74 is connected with an external power supply through wires.

[0026] Embodiment 2, refer to Figures 1-14 A kind of axial flow fan for mine, its core structure is developed around five core modules of cyclone dust removal, gas detection and intelligent switching, multistage purification, power drive and cooling guide, each module cooperates to realize the efficient processing and safe discharge of underground gas.

[0027] The cyclone dust removal module is used as the first line of defense for gas treatment, and the structural design thereof directly determines the load of subsequent treatment links. The top of the cyclone dust removal cone shell 1 is fixedly connected to the dust removal end cover 2 through bolts, so as to ensure the sealing of the connection and avoid gas leakage. The inner wall of the middle part of the cyclone dust removal cone shell 1 is in communication with the gas inlet pipeline 3. After the underground gas enters the cyclone dust removal cone shell 1 through the gas inlet pipeline 3 at a certain speed, the gas will rotate at a high speed along the inner wall of the cone shell. Under the action of centrifugal force, large particles of rock dust and viscous dust in the gas with a density greater than that of air are quickly thrown to the inner wall of the cone shell. These dusts gradually settle to the dust removal pipe 4 at the bottom of the cone shell under the action of gravity. The electric control valve 5 at the bottom of the dust removal pipe 4 is controlled by the PLC controller 74. According to the actual situation of the amount of dust generated underground, the PLC controller 74 can set the time interval for periodically opening the electric control valve 5, so as to timely remove the collected dust and avoid the accumulation and blockage of the dust in the dust removal pipe 4, thereby ensuring the continuous and stable operation of the dust removal system. The top of the dust removal end cover 2 is fixedly connected to the exhaust pipeline 6. The conical filter screen 7 is installed on one side of the inner wall of the dust removal end cover 2 by means of screw connection. This connection mode facilitates the subsequent disassembly, replacement or maintenance of the conical filter screen 7. After the cyclone dust removal, the gas flows upward and passes through the conical filter screen 7, so that the residual fine dust in the gas is further intercepted and filtered, thereby greatly reducing the dust content of the gas and providing a good foundation for subsequent gas detection and purification treatment. In order to avoid the blockage of the conical filter screen 7 due to the adhesion of dust after long-term use, the spray heads 8 are installed on the inner wall of the dust removal end cover 2 around the conical filter screen 7 at equal intervals. The ends of all the spray heads 8 are threadedly connected to the same annular water pipe 9. The annular water pipe 9 is in communication with the drain pipe 69 through a special water pipe, thereby forming a complete cleaning water route. When the PLC controller 74 detects that the air resistance of the conical filter screen 7 reaches a set threshold value through a related sensor, the valve connected to the annular water pipe 9 is automatically opened, so that part of the cold water in the drain pipe 69 flows into the annular water pipe 9 and is uniformly sprayed on the surface of the conical filter screen 7 through the spray heads 8, thereby flushing and cleaning the adhered dust. The cleaned sewage enters the subsequent pipeline together with the airflow and is finally discharged through the dust removal pipe 4 or a related channel without stopping the machine, thereby ensuring the continuous operation of the equipment. The gas detection and intelligent switching module is the core of realizing the automatic operation of the equipment, can automatically select the processing path according to the gas composition, the rectangular air inlet pipe 11 is fixedly connected with the exhaust pipe 6 through the connecting cover 10, which is the key channel for the gas to enter the subsequent processing link, the top inner wall of the rectangular air inlet pipe 11 is throughly connected with the drainage gas pipe 20, the one end of the drainage gas pipe 20 located in the inner wall of the rectangular air inlet pipe 11 is welded with the cone gas gathering cover 22, the horn structure of the cone gas gathering cover 22 can effectively converge the flowing gas, so that the gas can enter the drainage gas pipe 20 more fully and uniformly, and the accuracy of the detection result is ensured, the one end of the drainage gas pipe 20 away from the cone gas gathering cover 22 is communicated with the cylindrical protective shell 21, the inner wall of the cylindrical protective shell 21 is fixedly installed with the first gas detection module 23, the module adopts a multi-parameter integrated sensor array, integrates a gas sensor, a carbon monoxide sensor, a hydrogen sulfide sensor and a humidity sensor, can simultaneously detect four key parameters in the gas in real time, the amplification circuit module 24 arranged on the outer wall of the cylindrical protective shell 21 is signal connected with the first gas detection module 23, amplifies the detected weak electric signal, and then transmits it to the signal conditioning chip 25, the signal conditioning chip 25 filters, denoises and optimizes the amplified signal to ensure the stability and accuracy of the signal, and then transmits the optimized signal to the microcontroller 26 for data analysis and processing, the microcontroller 26 is signal connected with the PLC controller 74 through the CAN bus, and the processed gas composition data is fed back to the PLC controller 74 in real time, so as to provide accurate basis for the switching of the guide pipe, the inner wall of one side of the cylindrical protective shell 21 is also communicated with the gas guide pipe 27, the tail end of the gas guide pipe 27 is inserted into the second rectangular guide pipe 13, so that part of the detected gas can be introduced into the second rectangular guide pipe 13, ensuring the continuity of the gas flow in the subsequent purification link, the inner wall of one side of the bottom of the rectangular air inlet pipe 11 is throughly opened along the width direction and is provided with the sliding groove 14, the inner wall of the sliding groove 14 is slidably inserted with the sliding block 15, the outer wall of the bottom of the sliding block 15 is welded with the rectangular sealing baffle 16, the outer wall of one side of the bottom of the sliding block 15 is fixedly connected with the first electric telescopic rod 17 through a screw, the telescopic movement of the first electric telescopic rod 17 can drive the sliding block 15 to slide along the sliding groove 14 flexibly, in order to ensure the stability and accuracy of the movement of the sliding block 15, the both ends of the sliding block 15 are throughly opened and are provided with the limiting insertion hole 18, the inner wall of the limiting insertion hole 18 is slidably inserted with the limiting guide column 19, the limiting guide column 19 is fixedly installed on the inner wall of the rectangular air inlet pipe 11, forming a reliable guide structure, avoiding the deviation or jamming of the sliding block 15 during the movement, the first rectangular guide pipe 12 and the second rectangular guide pipe 13 are communicated with the inner walls of the two sides of the rectangular air inlet pipe 11 respectively, and the sizes of the pipe openings of the two are accurately matched with the size of the rectangular sealing baffle 16, so that the close plug-in cooperation can be realized, when the first gas detection module 23 detects that there is no harmful component in the gas, the PLC controller 74 will control the first electric telescopic rod 17 to be elongated,The pushing sliding block 15 drives the rectangular sealing baffle 16 to move to the direction of the second rectangular flow guide pipe 13 until completely blocking the pipe opening of the second rectangular flow guide pipe 13, at this time, the gas will directly enter the subsequent power driving and cooling link through the first rectangular flow guide pipe 12, when the first gas detection module 23 detects that the gas contains harmful gases such as gas, carbon monoxide, hydrogen sulfide and the like, the PLC controller 74 will control the first electric telescopic rod 17 to retract, drive the rectangular sealing baffle 16 to move reversely, block the pipe opening of the first rectangular flow guide pipe 12, so that the gas enters the second rectangular flow guide pipe 13 for multi-stage purification treatment, The second rectangular flow guide pipe 13 is used as a special treatment channel for harmful gases, and integrates multiple functions such as drying, adsorption, catalytic purification and reaction product collection. A first rectangular through slot 28 is formed through the outer wall of one side of the top of the second rectangular flow guide pipe 13, and a first rectangular cover plate 29 is fixed at the top of the first rectangular through slot 28 by bolts. This detachable connection mode facilitates the subsequent maintenance and replacement of internal components. A glass fiber filter membrane 30 is fixed to the outer wall at the bottom of the first rectangular cover plate 29 by screws. The glass fiber filter membrane 30 has the characteristics of small pore size and high filtration precision, can further filter the residual fine dust impurities in the gas, and avoid the attachment of impurities to the surface of the subsequent catalytic coating to affect the catalytic effect. A plurality of porous silica gel adsorption columns 31 are arranged on one side of the glass fiber filter membrane 30 at equal distances. The porous silica gel adsorption columns 31 have strong moisture absorption performance and can efficiently adsorb moisture in the gas, realizing the drying treatment of the gas and creating a suitable dry environment for the subsequent catalytic reaction. An activated carbon adsorption net box 32 is fixed on one side of the porous silica gel adsorption column 31. The activated carbon adsorption net box 32 has rich pore structure and strong adsorption capacity, can further adsorb organic odors and part of harmful gas molecules in the gas, and realizes the preliminary purification of the gas. In order to avoid the glass fiber filter membrane 30, the porous silica gel adsorption column 31 and the activated carbon adsorption net box 32 from falling off or being damaged during long-term use, a U-shaped tray 33 is welded and fixed to the inner wall at the bottom of the second rectangular flow guide pipe 13 directly below the three components. The U-shaped tray 33 can effectively support these components and collect the fine particles falling off the components, facilitating subsequent cleaning. A second rectangular through slot 34 is formed through the outer wall of the other end of the top of the second rectangular flow guide pipe 13. A second rectangular cover plate 35 is fixed at the top of the second rectangular through slot 34 by bolts. Three laterally sealing baffles 36 are welded to the outer wall at the bottom of the second rectangular cover plate 35 at equal distances. Independent purification chambers are formed between the laterally sealing baffles 36, ensuring that the gas can flow through each level of purification structure in turn and avoiding short circuit. Symmetrically distributed L-shaped brackets 37 are fixed to the outer wall of one side of the laterally sealing baffles 36 by screws. A first honeycomb ceramic 38, a second honeycomb ceramic 39 and a third honeycomb ceramic 40 are sequentially clamped and fixed between the three groups of L-shaped brackets 37. The honeycomb ceramic has the characteristics of large specific surface area, good air permeability and stable structure, and provides a reliable carrier for the catalytic coating. A first main catalytic coating 41 is coated on the outer wall of the first honeycomb ceramic 38. The coating is a Pt-Pd alloy catalytic oxidation coating, and the mass ratio of Pt to Pd is controlled between 1:1 and 3:1. The coating thickness is 50-80 μm, which can efficiently and synergistically catalyze the oxidation reaction of gas and CO, converting them into harmless carbon dioxide and water. A second main catalytic coating 42 is coated on the outer wall of the second honeycomb ceramic 39. The coating is a Fe2O3-CuO composite oxide selective catalytic coating, and the molar ratio of Fe2O3 to CuO is 6:4-7:3. The coating thickness is 40-60 μm, which can specifically catalyze the oxidation and conversion reaction of H2S, converting it into elemental sulfur and water.The outer wall of the third honeycomb ceramic 40 is coated with a catalytic coating 43, which is a CeO2-ZrO2 composite oxide oxygen storage type catalytic coating, the molar ratio of CeO2 to ZrO2 is 7:3-8:2, and the coating thickness is 30-50 μm. It can store and dynamically release oxygen during the reaction process, provide sufficient oxygen source for the first two stages of catalytic reaction, effectively inhibit the sulfur poisoning of the first main catalytic coating 41 and the second main catalytic coating 42, significantly improve the overall catalytic purification efficiency of the three harmful gases, and is fixed between the three groups of lateral sealing baffles 36. The mounting bracket 44 is fixed with equidistantly distributed electric heating rods 45, one side of the mounting bracket 44 is provided with a temperature sensor 46, the temperature sensor 46 is signal connected with the PLC controller 74, and the temperature in the purification chamber can be monitored in real time. Since the catalytic reaction needs to be carried out under suitable temperature conditions, when the temperature sensor 46 detects that the chamber temperature is lower than the set threshold, the PLC controller 74 will control the electric heating rod 45 to start heating until the temperature reaches the optimal range required for catalytic reaction, ensuring the stability of catalytic purification efficiency. When the temperature exceeds the set upper limit, the PLC controller 74 will control the electric heating rod 45 to stop heating to avoid damage to the equipment or affect the catalytic effect due to high temperature. The bottom side of the first honeycomb ceramic 38 and the second honeycomb ceramic 39 is welded and fixed with a flow guide baffle 47 along the inclined direction. The inclination angle of the flow guide baffle 47 is optimized and designed, which can smoothly guide the sulfur powder generated by the catalytic reaction to the lower side. The bottom of the flow guide baffle 47 is located in the inner wall of the second rectangular flow guide pipe 13 and is provided with a rectangular collecting groove along the width direction. The bottom inner wall of the rectangular collecting groove is clamped and fixed with a sulfur powder collecting shell 48. The sulfur powder collecting shell 48 is installed in a clamping manner, which is convenient for regular removal and cleaning of collected sulfur powder, avoiding secondary pollution caused by accumulation of sulfur powder in the pipe. The power driving module provides strong power for gas conveying, ensuring that the gas can smoothly pass through the various processing structures. The outer wall of the end of the first rectangular flow guide pipe 12 and the second rectangular flow guide pipe 13 is welded with a rectangular gas collecting cover 49. One side of the rectangular gas collecting cover 49 is fixedly connected with the axial flow shell 50 through bolts. The rectangular gas collecting cover 49 can uniformly guide the gas from different flow guide pipes into the axial flow shell 50 after converging the gas, and the bottom inner wall of the rectangular gas collecting cover 49 is provided with a second gas detection module 51. The second gas detection module 51 has the same structure as the first gas detection module 23 and can perform secondary detection on the processed gas to ensure that the gas purification meets the standard. If the gas does not meet the standard, the PLC controller 74 will issue an alarm signal and take corresponding processing measures. The inner wall of the axial flow shell 50 is provided with a fixed support 52 through screws. The center of the fixed support 52 is rotatably provided with a rotating sleeve 53 through a bearing. One side of the outer wall of the rotating sleeve 53 is welded with a first axial flow fan blade 54. The other side of the outer wall of the rotating sleeve 53 is welded with a first helical gear 55. One side of the first helical gear 55 is vertically engaged with a second helical gear 56. The shaft center of the second helical gear 56 is fixedly provided with a driving shaft 57 through screws. The driving shaft 57 is connected with a servo motor 58 through a shaft coupling. After the servo motor 58 is started, the second helical gear 56 is driven to rotate through the driving shaft 57, thereby driving the first helical gear 55 engaged therewith to rotate, and finally driving the rotating sleeve 53 and the first axial flow fan blade 54 to rotate synchronously to generate airflow driving force. The inner wall of the rotating sleeve 53 is inserted and mounted with a rotating shaft 59. The rotating shaft 59 and the rotating sleeve 53 are relatively rotatable through a bearing. One side of the outer wall of the rotating shaft 59 is welded with a second axial flow fan blade 60. The middle outer wall of the rotating shaft 59 is welded with a third helical gear 61. The other end of the outer wall of the rotating shaft 59 is rotatably mounted on a fixed bottom plate 62 through a bearing. The outer walls of the two sides of the fixed bottom plate 62 are both welded with a guide sliding rod 63. The guide sliding rod 63 is slidingly inserted into the inner wall of a guide rail 64. The guide rail 64 is parallelly distributed along the axis of the axial flow shell 50 to provide stable guidance for the movement of the fixed bottom plate 62. One side of the outer wall of the guide sliding rod 63 is fixedly connected with a second electric telescopic rod 65 through screws. The extension and retraction of the second electric telescopic rod 65 can drive the guide sliding rod 63 to slide along the guide rail 64, thereby driving the fixed bottom plate 62 and the rotating shaft 59 to move, realizing whether the second axial flow fan blade 60 is directly driven by the second helical gear 56, and realizing flexible change between double-leaf driving and single-leaf driving. The diameters of the first axial flow fan blade 54 and the second axial flow fan blade 60 are the same, the blade inclination directions are opposite, and the attack angle of the first axial flow fan blade 54 is smaller than that of the second axial flow fan blade 60. This structure design makes the airflow generated by the two groups of fan blades form a superposition effect when rotating, which can significantly improve the overall suction force and effectively overcome the pipeline resistance caused by multi-stage filtration and purification to ensure stable gas flow rate. The temperature reduction guide module is used for reducing the temperature of the exhaust gas, and simultaneously optimizing the gas exhaust path. The end of the axial flow shell 50 is fixed with an exhaust guide shell 66 through bolts. The inner wall of the exhaust guide shell 66 is rotatably provided with temperature reduction guide shells 67 distributed at equal distances. The temperature reduction guide shells 67 are designed in a hollow structure. One side of the outer wall of the temperature reduction guide shells 67 is rotatably provided with a water inlet pipe 68 through a sealing bearing. The other side of the outer wall of the temperature reduction guide shells 67 is rotatably provided with a water outlet pipe 69 through a sealing bearing. The design of the sealing bearing ensures that the temperature reduction guide shells 67 will not leak during rotation. External cold water enters the temperature reduction guide shells 67 through the water inlet pipe 68, and exchanges heat with the gas flowing through the surface of the temperature reduction guide shells 67. After absorbing the heat of the gas, the water is discharged from the water outlet pipe 69, realizing rapid cooling of the gas. The temperature reduction guide shells 67 avoid the direct discharge of high-temperature gas to cause underground temperature abnormalities. Limiting clamping plates 70 are welded to the outer walls of the bottom of the temperature reduction guide shells 67 along the width direction. The inner walls of the limiting clamping plates 70 are slidably connected with limiting guide columns 71. A plurality of limiting guide columns 71 are fixed to one side of the outer wall of a rectangular connecting plate 72. One side of the outer wall of the rectangular connecting plate 72 is fixedly connected with a third electric telescopic rod 73 through screws. The third electric telescopic rod 73 is controlled to perform telescopic movement under the control of a PLC controller 74, drives the rectangular connecting plate 72 to move, pushes the temperature reduction guide shells 67 to rotate around the axis, and adjusts the inclination angle of the temperature reduction guide shells 67, realizing flexible adjustment of the gas discharge direction, ensuring that the gas can be uniformly discharged to the designated area of the well according to the designed path, and improving the ventilation effect. The operation of the entire device is realized through centralized control of the PLC controller 74. The PLC controller 74 is fixedly installed on one side of the outer wall of the second rectangular guide pipe 13, is connected with an external power supply through wires, provides power support for the entire control system, and is electrically connected with core components such as the electric control valve 5, the first electric telescopic rod 17, the second electric telescopic rod 65, the third electric telescopic rod 73, the first gas detection module 23, the amplification circuit module 24, the signal conditioning chip 25, the microcontroller 26, the electric heating rod 45, the temperature sensor 46, the second gas detection module 51, and the servo motor 58 through signal lines. The PLC controller 74 can receive the operation data of each component in real time, issue control instructions according to the preset program and detection data, realize fully automatic operation of the device, greatly improve the operation efficiency and reliability of the device, and reduce the manual operation intensity.

[0028] Working principle: the mine axial flow fan of the application adopts PLC controller 74S7-200SMART as the core control unit, and is connected with electric control valve 5, first electric telescopic rod 17DTZ300, second electric telescopic rod 65DTZ300, third electric telescopic rod 73DTZ300, first gas detection module 23 (integrating MQ-2 gas sensor, MQ-7 carbon monoxide sensor, MQ-136 hydrogen sulfide sensor and HS1101 humidity sensor), second gas detection module 51 (same type as the first gas detection module 23), amplification circuit module 24LM324, signal conditioning chip 25AD8421, microcontroller 26STM32F103, electric heating rod 45SRY2-220 / 1, temperature sensor 46PT100 and servo motor 58130ST-M06025 through signal lines to establish stable electrical connection, all electrical components are connected with external power supply through the PLC controller 74, realizing power supply and unified control, and ensuring that all parts of the equipment run in an orderly manner; After the equipment is started, firstly, the gas pretreatment stage is entered, the underground gas enters the cyclone dust removal cone shell 1 through the gas inlet pipeline 3, under the action of centrifugal force, the large particles of dust with high density in the gas are thrown to the inner wall of the cone shell and settled to the dust removal pipe 4, the PLC controller 74 controls the electric control valve 5 to open according to the preset period, and the collected dust is discharged in time to avoid accumulation and blockage, the gas continues to flow upwards, passes through the conical filter screen 7 in the dust removal end cover 2, and is further filtered, at this time, if the PLC controller 74 detects that the air resistance of the conical filter screen 7 is too large, the valve on the annular water pipe 9 is opened, the spray head 8 sprays cold water to clean the conical filter screen 7, and the smooth flow of the gas is ensured, and the filtered gas enters the rectangular gas inlet pipe 11 connected with the connecting shell 10 through the gas outlet pipeline 6, and the preliminary dust removal treatment is completed; The gas entering the rectangular inlet pipe 11 is divided into two parts, one part enters the flow guide pipe 20 under the converging action of the conical gas gathering cover 22, flows through the first gas detection module 23 in the cylindrical protective shell 21, the module detects the concentration of gas, carbon monoxide, hydrogen sulfide and humidity data in real time, the detection signal is amplified by the amplification circuit module 24 LM324, optimized by the signal conditioning chip 25 AD8421, and then transmitted to the microcontroller 26 STM32F103, the microcontroller 26 analyzes and processes the data and feeds back to the PLC controller 74 S7-200SMART through the CAN bus, if the PLC controller 74 judges that there is no harmful component in the gas, the first electric telescopic rod 17 DTZ300 will be immediately extended to push the sliding block 15 to drive the rectangular sealing baffle 16 to block the second rectangular flow guide pipe 13, the gas directly enters the rectangular gas gathering cover 49 through the first rectangular flow guide pipe 12, at this time the PLC controller 74 starts the servo motor 58 130ST-M06025, the servo motor 58 drives the second bevel gear 56 to rotate through the driving shaft 57, and then drives the first bevel gear 55 and the rotating sleeve 53 to rotate, so that the first axial fan blade 54 starts to rotate, and pushes the gas to enter the axial flow shell 50 quickly, when the gas flows through the exhaust guide shell 66, the PLC controller 74 controls the third electric telescopic rod 73 DTZ300 to adjust the inclination angle of the cooling guide shell 67, at the same time, the external cold water enters the cooling guide shell 67 through the water inlet pipe 68, and exchanges heat with the gas to cool down, the clean gas after cooling is uniformly discharged to the designated area underground after guide, and the ventilation work is completed. If the first gas detection module 23 detects harmful gas in the gas, the PLC controller 74 will control the first electric telescopic rod 17DTZ300 to retract, driving the rectangular sealing baffle 16 to block the first rectangular flow guide pipe 12, and the gas enters the second rectangular flow guide pipe 13 for multi-stage purification treatment. The gas first flows through the glass fiber filter membrane 30, filters out small impurities, is dried by the porous silica gel adsorption column 31, and then is adsorbed by the activated carbon adsorption net box 32 to adsorb organic odor and part of harmful gas molecules, completing preliminary purification. Subsequently, the gas enters the purification chamber where the three sets of honeycomb ceramics are located. The PLC controller 74 controls the electric heating rod 45SRY2-220 / 1 to start according to the data detected by the temperature sensor 46PT100, adjusts the chamber temperature to the best range for catalytic reaction, and the gas successively passes through the first honeycomb ceramic 38, the second honeycomb ceramic 39 and the third honeycomb ceramic 40. The first main catalytic coating 41 cooperates with the catalytic oxidation of gas and CO to harmless substances, the second main catalytic coating 42 selectively catalyzes the conversion of H2S into sulfur powder, the auxiliary catalytic coating 43 dynamically stores oxygen and inhibits sulfur poisoning, and the purification efficiency is improved. The sulfur powder generated by the catalytic reaction falls into the sulfur powder collection shell 48 under the guidance of the flow guide baffle 47, realizing centralized collection. The purified gas enters the rectangular gas collecting cover 49, and the second gas detection module 51 rechecks it to ensure that the harmful gas concentration meets the standard, and then enters the axial flow shell 50. When the gas passes through the multi-layer filter structure, its wind power decreases and the gas flow rate decreases. To improve the gas flow rate, the second electric telescopic rod 65 is started at this time, driving the rotating shaft 59 to adjust the position, engaging the third bevel gear 61 with the second bevel gear 56, thereby driving the second axial flow fan blade 60 to rotate. The gas flows through the exhaust guide shell 66 under the drive of the double-axial flow fan blades, realizes pressurization and discharge, and is discharged after cooling and flow guiding by the cooling guide shell 67, completing the entire purification and ventilation process. During the entire operation process, the PLC controller 74 receives the feedback data of each detection module and sensor in real time, dynamically adjusts the running state of each execution component, ensures that the equipment is always in the best working state, realizes efficient dust removal, accurate detection, targeted purification and safe discharge of underground gas, and fully guarantees the safety and comfort of the underground operation environment.

[0029] In the description of the application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0030] The above description is only the preferred embodiment of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes within the technical scope disclosed by the application and according to the technical scheme and inventive concept of the application, which should be covered within the protection scope of the application.

Claims

1. An axial flow fan for mines, comprising a cyclone dust collector cone (1) and a third electrically operated telescopic rod (73), characterized in that, The top outer wall of the cyclone dust collector cone (1) is fixed with a dust collector end cap (2) by bolts, and the inner wall of the middle part of the cyclone dust collector cone (1) is connected to an air inlet pipe (3). A dust discharge pipe (4) is welded through the center of the bottom of the cyclone dust collector cone (1), and an electric control valve (5) is sealed at the bottom of the dust discharge pipe (4). An exhaust pipe (6) is connected at the top axial position of the dust collector end cap (2), and a conical filter screen (7) is threaded on one side of the inner wall of the dust collector end cap (2). A connecting cover (10) is fixed to the top of the exhaust pipe (6) by bolts, and a rectangular air inlet pipe (11) is fixed to one side of the connecting cover (10) by bolts. The inner wall of one side of the rectangular air intake pipe (11) is connected to a first rectangular guide pipe (12), and the inner wall of the other side of the rectangular air intake pipe (11) is connected to a second rectangular guide pipe (13). A sliding groove (14) is opened through the inner wall of the bottom side of the rectangular air intake pipe (11) along the width direction, and a sliding block (15) is slidably inserted into the inner wall of the sliding groove (14). A rectangular sealing baffle (16) is welded to the outer wall of the bottom of the sliding block (15), and a first electric telescopic rod (17) is fixed to the outer wall of the bottom side of the sliding block (15) by screws. A drainage air pipe (20) is connected through the inner wall of the top of the rectangular air intake pipe (11), and the drainage air pipe (20) is connected through the inner wall of the top side of the rectangular air intake pipe (11). A frustum gas-gathering hood (22) is welded to one end of the inner wall of the rectangular air inlet pipe (11). The end of the guide pipe (20) away from the frustum gas-gathering hood (22) is connected to a cylindrical protective shell (21). A first gas detection module (23) is installed on the inner wall of the cylindrical protective shell (21). An amplifier circuit module (24) is provided on one side of the outer wall of the cylindrical protective shell (21). The amplifier circuit module (24) is connected to a signal conditioning chip (25) and a microcontroller (26) through signal lines. A guide pipe (27) is connected to one side of the inner wall of the cylindrical protective shell (21). The end of the guide pipe (27) is inserted into the second rectangular guide pipe (13). The top side outer wall of the second rectangular guide tube (13) has a first rectangular through groove (28) through it, and the top of the first rectangular through groove (28) is fixed with a first rectangular cover plate (29) by bolts. The bottom outer wall of the first rectangular cover plate (29) is fixed with a glass fiber filter membrane (30) by screws. Two rows of porous silica gel adsorption columns (31) are provided on one side of the glass fiber filter membrane (30). An activated carbon adsorption mesh box (32) is fixedly provided on one side of the porous silica gel adsorption column (31). The second rectangular guide tube (13) has a first rectangular through groove (28) through it, and the top of the first rectangular through groove (28) has a first rectangular cover plate (29) fixed with bolts. The bottom outer wall of the first rectangular cover plate (29) has a glass fiber filter membrane (30) fixed with screws. Two rows of porous silica gel adsorption columns (31) are provided on one side of the glass fiber filter membrane (30). A U-shaped tray (33) is welded and fixed to the inner wall of the bottom of the flow tube (13) directly below the glass fiber filter membrane (30) and the activated carbon adsorption mesh box (32). A second rectangular through groove (34) is opened through the outer wall of the other end of the top of the second rectangular flow tube (13), and a second rectangular cover plate (35) is fixed to the top of the second rectangular through groove (34) by bolts. Three equidistant lateral sealing baffles (36) are welded to the outer wall of the bottom of the second rectangular cover plate (35), and one side of the outer wall of the lateral sealing baffle (36) is open through the outer wall of the second rectangular cover plate (35). Symmetrically distributed L-shaped brackets (37) are fixed by screws. A first honeycomb ceramic (38), a second honeycomb ceramic (39), and a third honeycomb ceramic (40) are sequentially snapped together between the three sets of L-shaped brackets (37). The outer wall of the first honeycomb ceramic (38) is coated with a first main catalytic coating (41), the outer wall of the second honeycomb ceramic (39) is coated with a second main catalytic coating (42), and the outer wall of the third honeycomb ceramic (40) is coated with a co-catalytic coating (43). Three sets of lateral sealing baffles (36) are also present. An installation bracket (44) is provided between the two rectangular tubes. Electric heating rods (45) are fixed on the installation bracket (44) at equal intervals. A temperature sensor (46) is provided on one side of the installation bracket (44). A rectangular gas gathering hood (49) is welded to the outer wall of the end of the first rectangular guide tube (12) and the second rectangular guide tube (13). An axial flow shell (50) is fixed to one side of the rectangular gas gathering hood (49) by bolts. A second gas detection module (51) is installed on the bottom inner wall of the rectangular gas gathering hood (49). The inner wall of the axial flow housing (50) is fitted with a fixed bracket (52) by screws, and a rotating sleeve (53) is rotatably mounted at the center of the fixed bracket (52) by bearings. A first axial flow fan blade (54) is welded and fixed to one side of the outer wall of the rotating sleeve (53), and a first helical gear (55) is welded and fixed to the other side of the outer wall of the rotating sleeve (53). A second helical gear (56) is vertically meshed to one side of the first helical gear (55), and a drive shaft (57) is fixed to the axis of the second helical gear (56) by screws. The drive shaft (57) is connected to a servo motor (58) by a coupling, and a rotating shaft (59) is inserted and installed on the inner wall of the rotating sleeve (53). A second axial flow fan blade (60) is welded to one side of the outer wall of the rotating shaft (59), and a third helical gear (61) is welded to the middle outer wall of the rotating shaft (59). The other end of the rotating shaft (59) is rotatably mounted on a fixed base plate (62) by bearings. The end of the axial flow housing (50) is fixed with an exhaust guide shell (66) by bolts. The inner wall of the exhaust guide shell (66) is rotatably installed with equally distributed cooling guide shells (67). One side of the outer wall of the cooling guide shell (67) is rotatably installed with a water inlet pipe (68) through a sealed bearing. The other side of the outer wall of the cooling guide shell (67) is rotatably installed with a drain pipe (69) through a sealed bearing.

2. The axial flow fan for mines according to claim 1, characterized in that, The first gas detection module (23) and the second gas detection module (51) are multi-parameter integrated gas sensor arrays, and the gas sensor arrays are composed of a gas sensor, a carbon monoxide sensor, a hydrogen sulfide sensor and a humidity sensor. The first gas detection module (23) and the second gas detection module (51) are connected to the microcontroller (26) via a CAN bus.

3. An axial flow fan for mines according to claim 1, characterized in that, The first main catalytic coating (41) is a Pt-Pd alloy catalytic oxidation coating, with a Pt to Pd mass ratio of 1:1 to 3:1 and a coating thickness of 50 to 80 μm, used for synergistic catalytic oxidation of gas and CO. The second main catalytic coating (42) is... -CuO composite oxide selective catalytic coating, and The molar ratio of CeO2 to CuO is 6:4 to 7:3, and the coating thickness is 40 to 60 μm. It is used for selectively catalyzing the oxidation conversion reaction of H2S. The co-catalytic coating (43) is a CeO2-ZrO2 composite oxide oxygen storage co-catalytic coating, and the molar ratio of CeO2 to ZrO2 is 7:3 to 8:

2. The coating thickness is 30 to 50 μm. It is used to store and dynamically release oxygen, while inhibiting the sulfur poisoning of the first main catalytic coating (41) and the second main catalytic coating (42), and synergistically improving the catalytic purification efficiency of the three gases.

4. An axial flow fan for mines according to claim 1, characterized in that, The dust removal end cap (2) is equipped with spray heads (8) that are evenly distributed around the inner wall of the conical filter screen (7), and the ends of the spray heads (8) are threaded to the same annular water pipe (9), which is connected to the drain pipe (69) through the water pipe.

5. An axial flow fan for mines according to claim 1, characterized in that, Both ends of the sliding block (15) have through-holes (18), and the inner walls of the through-holes (18) are slidably connected to the guide post (19). The sliding block (15) and the guide post (19) form a sliding fit. The opening size of the first rectangular guide tube (12) and the second rectangular guide tube (13) are adapted to the size of the rectangular sealing baffle (16). The first rectangular guide tube (12) and the second rectangular guide tube (13) form an insertion fit with the rectangular sealing baffle (16).

6. An axial flow fan for mines according to claim 1, characterized in that, A flow guide baffle (47) is welded and fixed on one side of the bottom of the first honeycomb ceramic (38) and the second honeycomb ceramic (39) along the inclined direction. The bottom of the flow guide baffle (47) is located on the inner wall of the second rectangular flow guide pipe (13) and a rectangular collection groove is opened through it along the width direction. A sulfur powder collection shell (48) is snapped and fixed on the bottom inner wall of the rectangular collection groove.

7. An axial flow fan for mines according to claim 1, characterized in that, Guide slide rods (63) are welded to both outer walls of the fixed base plate (62), and the guide slide rods (63) are slidably inserted into the inner wall of the guide rail (64). A second electric telescopic rod (65) is fixedly connected to one outer wall of the guide slide rod (63) by screws, and the two guide rails (64) are distributed parallel to the axis of the axial flow shell (50).

8. An axial flow fan for mines according to claim 1, characterized in that, The bottom two outer walls of the cooling guide shell (67) are welded with limit plates (70) along the width direction, and the inner wall of the limit plates (70) is slidably inserted with limit guide posts (71). Multiple limit guide posts (71) are welded and fixed to one side of the outer wall of the rectangular connecting plate (72), and one side of the outer wall of the rectangular connecting plate (72) is fixed with a third electric telescopic rod (73) by screws.

9. An axial flow fan for mines according to claim 1, characterized in that, The blade diameter of the first axial flow fan blade (54) is the same as that of the second axial flow fan blade (60), and the blade tilt direction of the first axial flow fan blade (54) is opposite to that of the second axial flow fan blade (60). The angle of attack of the first axial flow fan blade (54) is smaller than that of the second axial flow fan blade (60).

10. An axial flow fan for mines according to claim 7, characterized in that, A PLC controller (74) is fixed to one side of the outer wall of the second rectangular guide tube (13) by screws. The PLC controller (74) is electrically connected to the electric control valve (5), the first electric telescopic rod (17), the first gas detection module (23), the amplifier circuit module (24), the signal conditioning chip (25), the microcontroller (26), the electric heating rod (45), the temperature sensor (46), the second gas detection module (51), the servo motor (58), the second electric telescopic rod (65), and the third electric telescopic rod (73) through signal lines. The PLC controller (74) is connected to an external power supply through wires.

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