Coal mine working face stoping channel ventilation system

Abstract

The invention belongs to the technical field of coal mine ventilation, and particularly relates to a coal mine working face stoping channel ventilation system which comprises an air inlet pipeline, an air conveying pipeline and an air outlet pipeline, and an air distribution mechanism is jointly arranged among the air outlet end of the air inlet pipeline, the air inlet end of the air conveying pipeline and the air inlet end of the air outlet pipeline. And a cleaning mechanism is arranged on the air outlet pipeline. The air distribution mechanism comprises a three-way pipe fixedly connected with the air outlet end of the air inlet pipeline, the other two ends of the three-way pipe are fixedly connected with valve assemblies, and an air volume adjusting assembly is jointly arranged between the two valve assemblies. The valve assembly is matched with the air volume adjusting assembly, and the air volume fed into the stoping channel can be adjusted according to the mining progress of the coal mine working face; the valve assembly is matched with the second branch pipe to feed redundant clean air into the air outlet pipeline, air containing coal dust in the air outlet pipeline is diluted, and the pollution risk of the air exhausted out of the ground to the surrounding environment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine ventilation, and in particular relates to a ventilation system for a coal mine working face mining channel. Background Art

[0002] When workers are operating and maintaining coal mining equipment in the mining channel, the ventilation system can continuously provide them with sufficient oxygen to maintain normal breathing, ensure the life safety and physical health of the workers, and enable them to safely carry out various production activities underground. At the same time, underground coal mining operations in coal mines will generate a large amount of coal dust. The ventilation system can also effectively blow away and discharge the coal dust, reduce the concentration of coal dust in the air, reduce the risk of coal dust explosions, and prevent coal dust from being inhaled into the lungs of workers, preventing occupational diseases such as pneumoconiosis.

[0003] However, existing coal mine ventilation systems have several operational flaws: The fans used in coal mines are typically very powerful, making precise air volume control difficult. However, in the early stages of coal mining, the working surface of the mining tunnel is relatively small. When the ventilation system is operating, the air volume supplied to the mining tunnel is larger than required. This high air volume not only causes coal dust to fly and causes discomfort to workers inside, but also can over-dilute harmful gases like gas, resulting in false gas detection data. Localized high concentrations may go undetected, potentially creating safety hazards. Directly discharging excess air to the surface wastes energy. Summary of the Invention

[0004] In view of the above problems, an embodiment of the present invention provides a coal mine working face mining channel ventilation system, which can adjust the air volume sent into the mining channel as the coal mine working face mining progresses, and send excess clean air into the exhaust duct, while diluting the air containing coal dust inside it, thereby reducing the risk of pollution to the surrounding environment by the air after being discharged from the ground.

[0005] In order to achieve the above-mentioned objectives, an embodiment of the present invention provides the following technical solution: The present invention provides a ventilation system for a coal mine working face recovery channel, comprising an air intake pipe, an air transmission pipe, and an air outlet pipe. An air distribution mechanism is provided between the air outlet end of the air intake pipe, the air intake end of the air transmission pipe, and the air intake end of the air outlet pipe, and a cleaning mechanism is provided on the air outlet pipe. The air distribution mechanism comprises a tee pipe fixedly connected to the air outlet end of the air intake pipe, the other two ends of the tee pipe are fixedly connected to valve assemblies, an air volume adjustment assembly is provided between the two valve assemblies, and the two valve assemblies are respectively connected to branch pipe 1 and branch pipe 2. The end of branch pipe 1 away from the corresponding valve assembly is fixedly connected to the air transmission pipe, and the end of branch pipe 2 away from the corresponding valve assembly is connected to the cleaning mechanism. The air volume adjustment assembly controls the degree of opening of the two valve assemblies, dynamically distributes the incoming air, and allows some clean air to enter branch pipe 2 to assist the cleaning mechanism in diluting the coal powder in the air outlet pipe. The cleaning mechanism includes a trumpet-shaped intake pipe fixedly connected to the inlet end of the outlet pipe, one end of which is fixedly connected to the outer wall of the other end of the intake pipe. A screening assembly is installed within the intake pipe, and a dust removal assembly is installed within the outlet pipe, located above the screening assembly. Two third branches are also fixedly installed on both the second and outlet pipes. The screening assembly and dust removal assembly are driven by airflow to filter and prevent blockage, respectively, and clean the pipe interior. The screening assembly includes a rotating leaf pipe and a fixed brush plate. A screen is fixedly installed at the leaf pipe's inlet end.

[0006] According to a favorable embodiment, the valve assembly includes a rectangular shell fixedly connected to one end of the tee, and the sides of the two shells away from the tee are respectively fixedly connected to one end of branch pipe one and branch pipe two, and a sealing plate is slidably provided on the side of the shell close to the air volume adjustment assembly, and both sealing plates are connected to the air volume adjustment assembly.

[0007] According to a favorable embodiment, the air volume adjustment component includes a fixed base fixed on the ground inside the mining channel, a rotating shaft is rotatably provided on the upper side of the fixed base through an ear plate, three gears are coaxially sleeved on the outer side of the rotating shaft and evenly distributed along its length direction, a motor is fixedly provided on any one of the ear plates, the output shaft of the motor is fixedly connected to the corresponding end of the rotating shaft, two tooth plates 1 are fixedly provided on the lower side of the sealing plate above the gear, and a tooth plate 2 is fixedly provided on the middle position of the right side of the sealing plate on the left side of the gear, and the two tooth plates 1 and tooth plate 2 are respectively engaged with the corresponding gears.

[0008] According to a favorable embodiment, the tooth plate 1 is slidably connected to a guide plate 1 on the side away from the gear, the lower side of the guide plate 1 is fixedly connected to the upper side of the fixed seat, and the upper side of the fixed seat is also fixedly provided with a guide plate 2 with a T-shaped structure, and the horizontal section of the guide plate 2 is slidably connected to the lower side of the tooth plate 2.

[0009] According to a favorable embodiment, the screening assembly also includes a fixed ring fixedly arranged inside the intake pipe, the blade tube is rotatably arranged in the fixed ring, the blade tube includes a tube body, and a plurality of blade plates 1 are fixedly arranged on the surface of the tube body and are evenly distributed along the circumference. A guide channel 1 connecting the intake pipe and branch pipe 2 is opened near the blade tube on the surface of the intake pipe.

[0010] According to a favorable embodiment, a connecting plate is slidingly provided on the left side of the screen, and the upper and lower sides of the connecting plate are fixedly connected to the inner side of the fixed ring. The middle part of the connecting plate and the middle part of the brush plate are jointly fixedly provided with a connecting shaft, and the connecting shaft is rotatably connected to the center position of the screen, and the right side surface of the screen is in sliding contact with the brush plate.

[0011] According to a favorable embodiment, the dust removal assembly includes two rotating rings rotatably arranged inside the air outlet duct and distributed up and down, and a plurality of fenders 2 are fixedly arranged on the lower side of the two rotating rings, and a plurality of dust removal strips are commonly inserted between the upper and lower rotating rings, and the cleaning surface of the dust removal strip is in active contact with the inner wall of the air outlet duct, and a guide channel 2 is opened on the surface of the air outlet duct near the position corresponding to the fender 2, and there are two guide channels 2 in total, and the port of the branch pipe 2 is fixedly connected to the air outlet duct and extends into the corresponding guide channel 2.

[0012] According to a favorable embodiment, a plurality of notch grooves 1 are provided on the upper edge of the rotating ring located at the bottom, and the lower side of the dust removal strip is inserted into the corresponding notch groove 1. A plurality of notch grooves 2 are provided on the upper edge of the rotating ring located at the top, passing through the lower side thereof, and the dust removal strip is inserted into the corresponding notch groove 2.

[0013] According to a favorable embodiment, a support ring is fixedly provided on the inner wall of the lower end of the exhaust duct, the upper side of the support ring rolls against the lower side of the lower fender 2 through ball 1, and the outer side of the rotating ring rolls against the inner wall of the exhaust duct through ball 2.

[0014] According to an advantageous embodiment, a plurality of exhaust pipes are provided on the surface of the gas transmission pipeline along its length, and on-off valves are provided on the exhaust pipes.

[0015] Compared with the prior art, the coal mine working face recovery channel ventilation system provided by the embodiment of the present invention has the following beneficial effects: 1. The valve assembly provided in the present invention cooperates with the air volume adjustment assembly to adjust the air volume sent into the recovery channel as the coal mine working face mining progresses, and to send excess clean air into the exhaust pipe to realize dynamic gas distribution, which is more convenient to use while avoiding dust and other safety hazards.

[0016] 2. The valve assembly provided in the present invention cooperates with the second branch pipe to deliver excess clean air into the outlet pipe, directionally diluting the air containing coal dust inside the outlet pipe, thereby reducing the risk of pollution to the surrounding environment by the air after being discharged from the ground.

[0017] 3. The screening assembly provided in the present invention can not only filter the air inside the recovery channel when it enters the outlet pipe, thereby reducing the coal dust content of the air in the outlet pipe, but also the clean air transported from the air inlet pipe through branch pipe 2 can push the screen to rotate relative to the brush plate when it is sent into the intake pipe, thereby realizing non-driven mechanical friction cleaning, reducing the risk of screen blockage, and ensuring that the screen can filter the gas efficiently.

[0018] 4. The ash removal assembly provided in the present invention cooperates with branch pipe 2 and branch pipe 3, so that the gas directly sent from the air inlet pipe into the air outlet pipe can also make the ash removal strip in the ash removal assembly move along the inner wall of the air outlet pipe to remove ash, thereby realizing non-driven mechanical cleaning, thereby avoiding coal dust adhesion on the inner wall of the air outlet pipe and extending the maintenance period of the air outlet pipe.

[0019] 5. The present invention realizes non-driven mechanical filtering and blocking prevention by controlling the screening component through a unified airflow source, and realizes non-driven mechanical scraping and cleaning by controlling the dust removal component. At the same time, it also realizes directional dilution using clean air based on dynamic gas distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the overall three-dimensional structure diagram of the present invention.

[0021] Figure 2 This is a first-perspective three-dimensional structural diagram of the air distribution mechanism in the present invention.

[0022] Figure 3 It is a three-dimensional structural diagram of the air outlet pipe in the present invention.

[0023] Figure 4 It is a cross-sectional view of the gas outlet pipe in the present invention.

[0024] Figure 5 It is a cross-sectional view of the air intake pipe in the present invention.

[0025] Figure 6 It is a cross-sectional view of the screening assembly in the present invention.

[0026] Figure 7 It is a three-dimensional structural diagram of the dust removal component in the present invention.

[0027] Figure 8 It is a partial three-dimensional structural diagram of the dust removal component in the present invention.

[0028] Figure 9 Schematic diagram of the gas flow path inside the branch pipe 2 and the gas outlet pipe in the present invention.

[0029] Figure 10 This is a second perspective three-dimensional structural diagram of the air distribution mechanism in the present invention.

[0030] Reference numerals in the figure: 1, air inlet pipe; 2, air delivery pipe; 3, air outlet pipe; 4, air distribution mechanism; 41, tee pipe; 42, valve assembly; 421, housing; 422, sealing plate; 43, air volume adjustment assembly; 431, fixing seat; 432, gear; 433, motor; 434, tooth plate 1; 435, tooth plate 2; 44, branch pipe 1; 45, branch pipe 2; 5, cleaning mechanism; 51, suction pipe; 52 , screening component; 521, fixed ring; 522, leaf tube; 5221, leaf plate one; 523, guide channel one; 524, screen; 525, brush plate; 526, connecting plate; 53, dust removal component; 531, rotating ring; 532, dust removal strip; 533, guide channel two; 534, support ring; 535, ball one; 536, ball two; 537, leaf plate two; 54, branch pipe three; 6, exhaust pipe. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1 To the attached Figure 10 The present invention is described in further detail.

[0032] Please refer to Figure 1 A coal mine working face recovery channel ventilation system includes an air inlet pipe 1, a gas delivery pipe 2, and an air outlet pipe 3. An air distribution mechanism 4 is provided between the outlet end of the air inlet pipe 1, the air inlet end of the air delivery pipe 2, and the air inlet end of the air outlet pipe 3. A cleaning mechanism 5 is provided on the air outlet pipe 3. Several exhaust pipes 6 are provided along the length of the air delivery pipe 2, each of which is equipped with an on-off valve.

[0033] See Figure 1 、 Figure 2 and Figure 3 The air distribution mechanism 4 includes a tee pipe 41 fixedly connected to the air outlet end of the air inlet pipe 1, and the other two ends of the tee pipe 41 are fixedly connected to the valve assembly 42. An air volume adjustment assembly 43 is commonly provided between the two valve assemblies 42. The two valve assemblies 42 are respectively connected to a branch pipe 1 44 and a branch pipe 2 45. The end of the branch pipe 1 44 away from the corresponding valve assembly 42 is fixedly connected to the gas pipeline 2, and the end of the branch pipe 2 45 away from the corresponding valve assembly 42 is connected to the cleaning mechanism 5.

[0034] See Figure 2 and Figure 3The valve assembly 42 includes a rectangular shell 421 fixedly connected to one end of the tee pipe 41. The two shells 421 are fixedly connected to one end of branch pipe 1 44 and branch pipe 2 45 on one side away from the tee pipe 41. A sealing plate 422 is slidingly provided on the side of the shell 421 close to the air volume adjustment assembly 43. Both sealing plates 422 are connected to the air volume adjustment assembly 43.

[0035] See Figure 2 The air volume adjustment component 43 includes a fixed base 431 fixed on the ground inside the mining channel, a rotating shaft is rotatably provided on the upper side of the fixed base 431 through an ear plate, and three gears 432 are coaxially mounted on the outside of the rotating shaft and evenly distributed along its length direction, a motor 433 is fixed on any ear plate, and the output shaft of the motor 433 is fixedly connected to the corresponding end of the rotating shaft, and two tooth plates 434 symmetrically arranged in front and back are fixed on the lower side of the sealing plate 422 above the gear 432, and a tooth plate 2 435 is fixed on the middle position of the right side of the sealing plate 422 to the left of the gear 432, and the two tooth plates 1 434 and tooth plate 2 435 are respectively engaged with the corresponding gear 432.

[0036] See Figure 1 、 Figure 2 、 Figure 3 and Figure 10 The tooth plate 1 434 is slidably connected to the side of the gear 432 with a guide plate 1, and the lower side of the guide plate 1 is fixedly connected to the upper side of the fixed seat 431. The upper side of the fixed seat 431 is also fixedly provided with a guide plate 2 with a T-shaped structure, and the horizontal section of the guide plate 2 is slidably connected to the lower side of the tooth plate 2 435.

[0037] During specific operation, the air inlet pipe 1 and the air outlet pipe 3 are both connected to an external fan. The fan connected to the air inlet pipe 1 introduces external air, and the fan connected to the air outlet pipe 3 extracts the air from the working face of the mining channel. When the external fan is working, the gas is sent into the three-way pipe 41 through the air inlet pipe 1. The other two ends of the three-way pipe 41 are controlled by the corresponding valve components 42. In the early stage of coal mining, in order to prevent a large amount of air from entering the working face of the mining channel, at this time, the motor 433 drives the shaft to drive the gear 432 to rotate, and the middle gear 432 rotates and drives the gear plate 2 435 to move to the left. , causing the tooth plate 2 435 to move a certain distance toward the inside of the corresponding shell 421, thereby shrinking the gas circulation port inside the shell 421, reducing the amount of external gas entering the gas pipeline 2 through the shell 421, and realizing dynamic gas distribution. At the same time, the rotation of the other two gears 432 will also drive the tooth plate 1 434 to move downward, making the gas circulation port inside the corresponding shell 421 larger, thereby introducing a part of the trapped gas into the outlet pipe 3. This part of relatively clean air can dilute the air containing coal powder inside the outlet pipe 3, thereby reducing the concentration of coal powder after discharge.

[0038] See Figure 3 、 Figure 4 and Figure 5 The cleaning mechanism 5 includes an air intake pipe 51 fixedly connected to the air inlet end of the air outlet pipe 3 and having one end in a trumpet shape. The lower end of the branch pipe 2 45 is fixedly connected to the outer wall of the other end of the air intake pipe 51. A screening component 52 is provided in the air intake pipe 51, and a dust removal component 53 located above the screening component 52 is provided inside the air outlet pipe 3. Two branch pipes 3 54 are also fixedly provided on the branch pipe 2 45 and the air outlet pipe 3.

[0039] See Figure 4 、 Figure 5 and Figure 6 The screening assembly 52 includes a fixed ring 521 fixedly arranged inside the intake pipe 51. The fixed ring 521 is located at the small-diameter portion of the trumpet port of the intake pipe 51. A leaf tube 522 is rotatably arranged inside the fixed ring 521. The leaf tube 522 includes a tube body. A plurality of leaf plates 5221 are fixedly arranged on the surface of the tube body and are evenly distributed along the circumference thereof. A guide channel 523 connecting the intake pipe 51 and the branch pipe 45 is provided near the leaf tube 522 on the surface of the intake pipe 51.

[0040] See Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 9 The screening assembly 52 also includes a screen 524 and a brush plate 525 fixedly arranged at the air inlet port of the leaf tube 522. The right surface of the screen 524 is in sliding contact with the brush plate 525. A connecting plate 526 is slidingly arranged on the left side of the screen 524. The upper and lower sides of the connecting plate 526 are fixedly connected to the inner side of the fixing ring 521. The middle part of the connecting plate 526 and the middle part of the brush plate 525 are jointly fixed with a connecting shaft, and the connecting shaft is rotatably connected to the center position of the screen 524.

[0041] During operation, the clean air in the branch pipe 2 45 enters the air intake pipe 51 through the guide channel 1 523 and then enters the air outlet pipe 3. During this process, the gas is discharged along the guide channel 1 523 and pushes the leaf plate 1 5221 on the surface of the leaf pipe 522 to rotate, thereby causing the leaf pipe 522 to rotate. The rotation of the leaf pipe 522 drives the screen 524 to rotate relative to the brush plate 525. The centrifugal force generated by the rotation of the screen 524 is used to throw off the attached dust, forming radial cleaning, and the relative movement and friction between the brush plate 525 and the screen 524 is used to form axial cleaning. Figure 9 As shown ( Figure 9The non-black solid arrows in the figure represent the gas flow path), the air inside the working face of the recovery channel enters the interior of the suction pipe 51 from the trumpet port of the suction pipe 51, and is filtered through the screen 524. At the same time, the screen 524 continuously rotates relative to the brush plate 525, so that the brush plate 525 can continuously clean the screen 524, reducing the risk of blockage of the screen 524, thereby reducing the coal powder content entering the exhaust pipe 3, and avoiding the air containing a high coal powder content from polluting the environment after being discharged.

[0042] See Figure 4 、 Figure 5 、 Figure 7 and Figure 8 The dust removal component 53 includes two rotating rings 531 rotatably arranged inside the air outlet pipe 3 and distributed up and down. A plurality of leaf plates 537 are fixedly arranged on the lower side of the two rotating rings 531. A plurality of dust removal strips 532 are commonly inserted between the upper and lower rotating rings 531. The cleaning surface of the dust removal strip 532 is in contact with the inner wall of the air outlet pipe 3. A guide channel 533 is provided on the surface of the air outlet pipe 3 near the position corresponding to the leaf plate 537. There are two guide channels 533 in total. The port of the branch pipe 45 is fixedly connected to the air outlet pipe 3 and extends into the corresponding guide channel 533.

[0043] See Figure 4 、 Figure 5 、 Figure 7 and Figure 8 The upper edge of the rotating ring 531 located at the bottom is provided with a plurality of notch grooves 1, and the lower side of the dust removal strip 532 is inserted into the corresponding notch groove 1. The upper edge of the rotating ring 531 located at the top is provided with a plurality of notch grooves 2 running through its lower side, and the dust removal strip 532 is inserted into the corresponding notch groove 2.

[0044] See Figure 4 、 Figure 5 、 Figure 7 、 Figure 8 and Figure 9 A support ring 534 is fixedly provided on the inner wall of the lower end of the outlet pipe 3. The upper side of the support ring 534 rolls against the lower side of the lower fender 2 537 through the ball 1 535, and the outer side of the rotating ring 531 rolls against the inner wall of the outlet pipe 3 through the ball 2 536.

[0045] During operation, the air in the branch pipe 2 45 can also enter the guide channel 2 533 through the branch pipe 3 54, and then enter the air outlet pipe 3. Figure 9As shown; in this process, after the air is discharged along the guide channel 2 533, it can push the fender 2 537 to rotate, so that the rotating ring 531 can rotate. The rotation of the rotating ring 531 will drive the dust removal strip 532 to rotate along the inner wall of the air outlet pipe 3. The dust removal strip 532 scrapes and cleans the inner wall of the air outlet pipe 3, forming a circumferential cleaning, reducing the amount of coal dust attached to the inner wall of the air outlet pipe 3, and the scraped coal dust is discharged with the gas.

[0046] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A coal mine working face mining channel ventilation system, comprising an air inlet pipe, a gas transmission pipe, and an air outlet pipe, characterized in that: An air distribution mechanism is provided between the air outlet end of the air inlet pipe, the air inlet end of the air transmission pipe and the air inlet end of the air outlet pipe, and a cleaning mechanism is provided on the air outlet pipe; The air distribution mechanism includes a tee pipe fixedly connected to the air outlet end of the air inlet pipe, the other two ends of the tee pipe are fixedly connected to the valve assembly, an air volume adjustment assembly is commonly provided between the two valve assemblies, and the two valve assemblies are respectively connected to a branch pipe 1 and a branch pipe 2, the end of the branch pipe 1 away from the corresponding valve assembly is fixedly connected to the air delivery pipe, and the end of the branch pipe 2 away from the corresponding valve assembly is connected to the cleaning mechanism; The opening degree of the two valve components is controlled by the air volume adjustment component, which dynamically distributes the incoming air and allows part of the clean air to enter the second branch pipe to assist the cleaning mechanism in diluting the coal powder in the outlet pipe; The cleaning mechanism includes an air intake pipe fixedly connected to the air inlet end of the air outlet pipe and having one end in a trumpet shape, the lower end of the branch pipe 2 is fixedly connected to the outer wall of the other end of the air intake pipe, a screening assembly is provided in the air intake pipe, and an ash removal assembly located above the screening assembly is provided inside the air outlet pipe, and two branch pipes 3 are also fixedly provided on the branch pipe 2 and the air outlet pipe; The screening assembly includes a rotatable leaf tube and a fixed brush plate. The air inlet port of the leaf tube is fixedly provided with a screen, and the right side surface of the screen is in sliding contact with the brush plate. In the process of the clean air in branch pipe 2 entering the outlet pipe from the intake pipe, it will drive the screen to rotate relative to the brush plate. The brush plate will continuously clean the screen to achieve filtration and anti-blocking. At the same time, the clean air in branch pipe 2 also enters the outlet pipe through branch pipe 3 and drives the dust removal component to scrape and clean the inner wall of the outlet pipe.

2. A coal mine working face recovery channel ventilation system according to claim 1, characterized in that: The valve assembly includes a rectangular shell fixedly connected to one end of the tee pipe, and the two sides of the shell away from the tee pipe are respectively fixedly connected to one end of branch pipe one and branch pipe two. A sealing plate is slidably provided on the side of the shell close to the air volume adjustment assembly, and both sealing plates are connected to the air volume adjustment assembly.

3. A coal mine working face recovery channel ventilation system according to claim 2, characterized in that: The air volume adjustment component includes a fixed seat fixed on the ground inside the recovery channel, a rotating shaft is rotatably provided on the upper side of the fixed seat through an ear plate, three gears are coaxially sleeved on the outer side of the rotating shaft and evenly distributed along its length direction, a motor is fixed on any one of the ear plates, the output shaft of the motor is fixedly connected to the corresponding end of the rotating shaft, two tooth plates 1 are fixedly provided on the lower side of the sealing plate above the gear, and a tooth plate 2 is fixedly provided on the middle position of the right side of the sealing plate on the left side of the gear, and the two tooth plates 1 and tooth plate 2 are respectively engaged with the corresponding gears.

4. A coal mine working face recovery channel ventilation system according to claim 3, characterized in that: The side of the tooth plate 1 away from the gear is slidably connected to a guide plate 1, the lower side of the guide plate 1 is fixedly connected to the upper side of the fixed seat, and the upper side of the fixed seat is also fixedly provided with a guide plate 2 with a T-shaped structure, and the horizontal section of the guide plate 2 is slidably connected to the lower side of the tooth plate 2.

5. A coal mine working face mining channel ventilation system according to claim 1, characterized in that: The screening assembly also includes a fixed ring fixedly arranged inside the intake pipe, the leaf tube is rotatably arranged in the fixed ring, the leaf tube includes a tube body, the surface of the tube body is fixedly provided with a plurality of leaf plates 1 evenly distributed along its circumference, and a guide channel 1 connecting the intake pipe and branch pipe 2 is opened near the leaf tube on the surface of the intake pipe.

6. A coal mine working face recovery channel ventilation system according to claim 5, characterized in that: A connecting plate is slidingly provided on the left side of the screen, and the upper and lower sides of the connecting plate are fixedly connected to the inner side of the fixing ring. The middle of the connecting plate and the middle of the brush plate are jointly fixed with a connecting shaft, and the connecting shaft is rotatably connected to the center position of the screen.

7. A coal mine working face recovery channel ventilation system according to claim 1, characterized in that: The dust removal assembly includes two rotating rings rotatably arranged inside the air outlet pipe and distributed up and down, a plurality of fenders 2 are fixedly arranged on the lower side of the two rotating rings, and a plurality of dust removal strips are commonly inserted between the upper and lower rotating rings, the cleaning surface of the dust removal strips movably contacts the inner wall of the air outlet pipe, and a guide channel 2 is opened on the surface of the air outlet pipe near the position corresponding to the fender 2, and there are two guide channels 2 in total, and the port of the branch pipe 2 is fixedly connected to the air outlet pipe and extends into the corresponding guide channel 2.

8. A coal mine working face recovery channel ventilation system according to claim 7, characterized in that: The upper edge of the rotating ring located at the bottom is provided with multiple notch grooves 1, and the lower side of the dust removal strip is inserted into the corresponding notch groove 1. The upper edge of the rotating ring located at the top is provided with multiple notch grooves 2 that pass through its lower side, and the dust removal strip is inserted into the corresponding notch groove 2.

9. A coal mine working face mining channel ventilation system according to claim 7, characterized in that: A support ring is fixedly provided on the inner wall of the lower end of the air outlet pipe, the upper side of the support ring rolls against the lower side of the lower fender 2 through ball 1, and the outer side of the rotating ring rolls against the inner wall of the air outlet pipe through ball 2.

10. A coal mine working face mining channel ventilation system according to claim 2, characterized in that: The surface of the gas pipeline is provided with a plurality of exhaust pipes along its length direction, and the exhaust pipes are provided with on-off valves.

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