A ventilation system for a coal face extraction roadway

Abstract

The present application belongs to the technical field of coal mine ventilation, and particularly relates to a coal mine working face recovery channel ventilation system, which comprises an air inlet pipeline, an air conveying pipeline and an air outlet pipeline, 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 are jointly provided with an air distribution mechanism, and the air outlet pipeline is provided with a cleaning mechanism. The air distribution mechanism comprises a tee pipe fixedly connected with the air outlet end of the air inlet pipeline, the other two ends of the tee pipe are fixedly connected with valve assemblies, and an air volume adjusting assembly is jointly arranged between the two valve assemblies. The valve assembly and the air volume adjusting assembly cooperate to adjust the air volume sent into the recovery channel according to the mining progress of the coal mine working face. The valve assembly and the branch pipe two cooperate to send the excess clean air into the air outlet pipeline, dilute the air containing coal dust in the air outlet pipeline and reduce the pollution risk of the air discharged to the ground to the surrounding environment.

Description

Technical Field

[0001] This invention belongs to the field of coal mine ventilation technology, and particularly relates to a ventilation system for a coal mine working face mining passage. Background Technology

[0002] When workers are operating or maintaining coal mining equipment in the mining tunnel, the ventilation system can continuously provide them with sufficient oxygen to maintain normal breathing, ensuring their safety and health, and enabling them to carry out various production activities safely underground. At the same time, coal mining operations underground generate a large amount of coal dust, and the ventilation system can effectively disperse and expel the coal dust, reduce the concentration of coal dust in the air, reduce the risk of coal dust explosions, and prevent workers from inhaling coal dust into their lungs, thus preventing occupational diseases such as pneumoconiosis.

[0003] However, existing coal mine ventilation systems have the following drawbacks: The fans used in coal mines are generally very powerful, making precise airflow control difficult. In the early stages of coal mining, the working face of the mining tunnel is small, and the ventilation system supplies a relatively large volume of air to the tunnel compared to actual needs. This large airflow not only causes coal dust to fly, causing discomfort to workers, but also may excessively dilute harmful gases such as methane, leading to false gas detection data. While the methane concentration may appear low, there may actually be undetected areas of high concentration, potentially creating safety hazards. Directly venting the excess airflow to the surface results in energy waste. Summary of the Invention

[0004] In view of the above problems, the present invention provides a ventilation system for a coal mine working face mining channel, which can adjust the air volume sent into the mining channel according to the mining progress of the coal mine working face, and send excess clean air into the exhaust pipe, while diluting the air containing coal dust inside, thereby reducing the risk of pollution to the surrounding environment by the air discharged to the ground.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a ventilation system for a coal mine working face mining passage, including an air inlet pipe, an air delivery pipe, and an air outlet pipe. A gas distribution mechanism is shared between the air outlet end of the air inlet pipe, the air inlet end of the air delivery pipe, and the air inlet end of the air outlet pipe. A cleaning mechanism is provided on the air outlet pipe. The gas distribution mechanism includes a tee pipe fixedly connected to the air outlet end of the air inlet pipe. Valve assemblies are fixedly connected to both ends of the tee pipe. An airflow regulating component is shared between the two valve assemblies. Branch pipe one and branch pipe two are respectively connected to the two valve assemblies. The end of branch pipe one furthest from the corresponding valve assembly is fixedly connected to the air delivery pipe, and the end of branch pipe two furthest from the corresponding valve assembly is connected to the cleaning mechanism. The airflow regulating component controls the opening degree of the two valve assemblies, dynamically distributing the incoming air and allowing some clean air to enter branch pipe two to assist the cleaning mechanism in diluting the coal dust in the air outlet pipe. The cleaning mechanism includes an air intake pipe fixedly connected to the air inlet end of the air outlet pipe, with one end shaped like a trumpet. The lower end of the second branch pipe is fixedly connected to the outer wall of the other end of the air intake pipe. A sieving component is installed inside the air intake pipe, and a dust removal component is installed inside the air outlet pipe above the sieving component. Two third branch pipes are also fixedly installed on the second branch pipe and the air outlet pipe. Airflow drives the sieving component and the dust removal component to perform filtration and anti-clogging, and cleaning of the inside of the pipe, respectively. The sieving component includes a rotating leaf tube and a fixed brush plate. A screen is fixedly installed at the air inlet port of the leaf tube.

[0006] According to an advantageous embodiment, the valve assembly includes a rectangular housing fixedly connected to one end of a tee pipe, two housings respectively fixedly connected to one end of branch pipe one and branch pipe two on the side away from the tee pipe, and a sealing plate slidably disposed on the side of the housing near the airflow regulating assembly, both sealing plates being connected to the airflow regulating assembly.

[0007] According to an advantageous embodiment, the air volume regulating component includes a fixed base fixedly installed on the ground inside the mining channel. A rotating shaft is rotatably installed on the upper side of the fixed base via an ear plate. Three gears evenly distributed along the length direction are coaxially mounted on the outer side of the rotating shaft. A motor is fixedly installed on any one ear plate. The output shaft of the motor is fixedly connected to one end of the rotating shaft. Two toothed plates symmetrically arranged are fixedly installed on the lower side of the sealing plate above the gears. A toothed plate is fixedly installed at the middle right side of the sealing plate to the left of the gears. The two toothed plates and the toothed plate mesh with the corresponding gears respectively.

[0008] According to an advantageous embodiment, a guide plate is slidably connected to the side of the toothed plate away from the gear, the lower side of the guide plate is fixedly connected to the upper side of the fixed seat, and a T-shaped guide plate is also fixedly provided on the upper side of the fixed seat, the horizontal section of the guide plate is slidably connected to the lower side of the toothed plate.

[0009] According to an advantageous embodiment, the screening assembly further includes a fixing ring fixedly disposed inside the suction pipe, the leaf pipe being rotatably disposed within the fixing ring, the leaf pipe including a pipe body, the surface of the pipe body being fixedly disposed with a plurality of leaf plates evenly distributed circumferentially, and a guide channel connecting the suction pipe and the branch pipe being opened on the surface of the suction pipe near the leaf pipe.

[0010] According to an advantageous embodiment, a connecting plate is slidably disposed 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. A connecting shaft is fixedly disposed in the middle of the connecting plate and the middle of the brush plate. 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 an advantageous embodiment, the ash removal assembly includes two rotating rings rotatably disposed inside the air outlet pipe and distributed vertically. Multiple blades are fixedly disposed on the lower side of each of the two rotating rings. Multiple ash removal strips are inserted between the upper and lower rotating rings. The cleaning surface of the ash removal strips is in contact with the inner wall of the air outlet pipe. A guide channel is provided on the surface of the air outlet pipe near the corresponding blade. There are two guide channels in total. The port of the branch pipe is fixedly connected to the air outlet pipe and extends into the corresponding guide channel.

[0012] According to an advantageous embodiment, the upper edge of the lower rotating ring is provided with a plurality of notches and slots, and the lower side of the ash removal strip is inserted into the corresponding notch and slot. The upper edge of the upper rotating ring is provided with a plurality of notches and slots penetrating its lower side, and the ash removal strip is inserted into the corresponding notch and slot.

[0013] According to an advantageous embodiment, a support ring is fixedly provided on the lower inner wall of the air outlet pipe. The upper side of the support ring and the lower side of the lower blade plate II are in rolling contact through a ball bearing. The outer side of the rotating ring and the inner wall of the air outlet pipe are in rolling contact through a ball bearing.

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

[0015] Compared with the prior art, the ventilation system for the coal mine working face retreat channel provided by the present invention has the following beneficial effects: 1. The valve assembly and air volume adjustment assembly set in the present invention can adjust the air volume sent into the retreat channel according to the mining progress of the coal mine working face, and send the excess clean air into the air outlet pipe to realize dynamic gas distribution, which is more convenient to use and avoids dust and other safety hazards.

[0016] 2. The valve assembly and branch pipe 2 in this invention work together to send excess clean air into the exhaust pipe, thereby diluting the air containing coal dust inside the exhaust pipe and reducing the risk of pollution to the surrounding environment after the air is discharged to the ground.

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

[0018] 4. The ash removal component in this invention works in conjunction with branch pipe two and branch pipe three, so that the gas directly sent from the inlet pipe into the outlet pipe can also cause the ash removal strip in the ash removal component to move along the inner wall of the outlet pipe to remove ash, thereby achieving non-driven mechanical cleaning, thus avoiding coal dust adhesion on the inner wall of the outlet pipe and extending the maintenance cycle of the outlet pipe.

[0019] 5. This invention achieves non-drive mechanical filtration and anti-clogging by controlling the screening component through a unified airflow source and achieves non-drive mechanical scraping and cleaning by controlling the ash removal component. At the same time, it also achieves directional dilution using clean air based on dynamic gas distribution. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

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

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

[0023] Figure 4 This is a cross-sectional view of the air outlet pipe in this invention.

[0024] Figure 5 This is a cross-sectional view of the inhalation tube in this invention.

[0025] Figure 6 This is a cross-sectional view of the screening component in this invention.

[0026] Figure 7 This is a three-dimensional structural diagram of the ash removal component in this invention.

[0027] Figure 8 This is a partial three-dimensional structural diagram of the ash removal component in this invention.

[0028] Figure 9 This is a schematic diagram of the gas flow path inside the branch pipe and the outlet pipe in this invention.

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

[0030] Figure reference numerals: 1. Inlet pipe; 2. Outlet pipe; 3. Outlet pipe; 4. Air distribution mechanism; 41. T-joint; 42. Valve assembly; 421. Housing; 422. Sealing plate; 43. Air volume adjustment assembly; 431. Mounting base; 432. Gear; 433. Motor; 434. Gear plate one; 435. Gear plate two; 44. Branch pipe one; 45. Branch pipe two; 5. Cleaning mechanism; 51. Suction pipe; 52. 521. Screening assembly; 522. Fixed ring; 522. Leaf tube; 5221. Leaf plate one; 523. Guide channel one; 524. Screen; 525. Brush plate; 526. Connecting plate; 53. Ash removal assembly; 531. Rotating ring; 532. Ash removal strip; 533. Guide channel two; 534. Support ring; 535. Ball bearing one; 536. Ball bearing two; 537. Leaf plate two; 54. Branch pipe three; 6. Exhaust pipe. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 To be continued Figure 10 The present invention will now be described in further detail.

[0032] Please refer to the following: Figure 1 A ventilation system for a coal mine working face mining passage includes an intake pipe 1, an air conveying pipe 2, and an exhaust pipe 3. An air distribution mechanism 4 is provided between the exhaust end of the intake pipe 1, the intake end of the air conveying pipe 2, and the intake end of the exhaust pipe 3. A cleaning mechanism 5 is provided on the exhaust pipe 3. Several exhaust pipes 6 are arranged along the length of the air conveying pipe 2, and on / off valves are provided on the exhaust pipes 6.

[0033] See Figure 1 , Figure 2 and Figure 3 The air distribution mechanism 4 includes a three-way pipe 41 fixedly connected to the air outlet end of the air inlet pipe 1. The other two ends of the three-way pipe 41 are fixedly connected to valve assemblies 42. An air volume regulating assembly 43 is provided between the two valve assemblies 42. Branch pipe 1 44 and branch pipe 2 45 are respectively connected to the two valve assemblies 42. The end of branch pipe 1 44 away from the corresponding valve assembly 42 is fixedly connected to the air supply pipe 2. The end of 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 housing 421 that is fixedly connected to one end of the three-way pipe 41. The two housings 421 are fixedly connected to one end of branch pipe 44 and branch pipe 45 respectively on the side away from the three-way pipe 41. A sealing plate 422 is slidably provided on the side of the housing 421 near the air volume regulating assembly 43. Both sealing plates 422 are connected to the air volume regulating assembly 43.

[0035] See Figure 2 The air volume regulating component 43 includes a fixed base 431 fixedly installed on the ground inside the mining channel. A rotating shaft is rotatably installed on the upper side of the fixed base 431 via an ear plate. Three gears 432 evenly distributed along the length direction are coaxially mounted on the outer side of the rotating shaft. A motor 433 is fixedly installed on any one ear plate. The output shaft of the motor 433 is fixedly connected to the corresponding end of the rotating shaft. Two toothed plates 434 are fixedly installed on the lower side of the sealing plate 422 above the gears 432. A toothed plate 435 is fixedly installed in the middle right position of the sealing plate 422 to the left of the gears 432. The two toothed plates 434 and the toothed plate 435 respectively mesh with the corresponding gears 432.

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

[0037] In actual operation, both the intake pipe 1 and the exhaust pipe 3 are connected to an external fan. The fan connected to the intake pipe 1 introduces external air, and the fan connected to the exhaust pipe 3 extracts air from the working face of the mining tunnel. When the external fan is working, it sends gas through the intake pipe 1 into the three-way pipe 41. The other two ends of the three-way pipe 41 are controlled by corresponding valve components 42. In the early stages of coal mining, in order to prevent a large amount of air from entering the working face of the mining tunnel, the motor 433 drives the shaft to rotate the gear 432. The rotation of the gear 432 simultaneously drives the toothed plate 435 to move to the left. This causes the toothed plate 435 to move a certain distance toward the interior of the corresponding outer shell 421, thereby reducing the gas flow port inside the outer shell 421 and decreasing the amount of external gas entering the gas transmission pipe 2 through the outer shell 421, thus achieving dynamic gas distribution. At the same time, the rotation of the other two gears 432 will also drive the toothed plate 434 to move downward, thereby increasing the gas flow port inside the corresponding outer shell 421, thus introducing a portion of the trapped gas into the gas outlet pipe 3. This relatively clean air can dilute the air containing coal dust inside the gas outlet pipe 3, thereby reducing the concentration of coal dust 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 shaped like a trumpet. The lower end of the branch pipe 45 is fixedly connected to the outer wall of the other end of the air intake pipe 51. A sieving component 52 is provided inside the air intake pipe 51, and a dust removal component 53 located above the sieving component 52 is provided inside the air outlet pipe 3. Two branch pipes 54 are also fixedly provided on the branch pipe 45 and the air outlet pipe 3.

[0039] See Figure 4 , Figure 5 and Figure 6 The screening component 52 includes a fixing ring 521 fixedly disposed inside the suction pipe 51. The fixing ring 521 is located at the small diameter of the horn port of the suction pipe 51. A leaf tube 522 is rotatably disposed inside the fixing ring 521. The leaf tube 522 includes a tube body. Multiple leaf plates 5221 are fixedly disposed on the surface of the tube body and evenly distributed along its circumference. A guide channel 523 connecting the suction pipe 51 and the branch pipe 45 is opened on the surface of the suction pipe 51 near the leaf tube 522.

[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 installed at the air inlet of the leaf tube 522. The right side surface of the screen 524 is in sliding contact with the brush plate 525. A connecting plate 526 is slidably installed 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. A connecting shaft is fixedly installed in the middle of the connecting plate 526 and the middle of the brush plate 525. The connecting shaft is rotatably connected to the center position of the screen 524.

[0041] In actual operation, clean air in branch pipe 2 45 enters the intake pipe 51 through guide channel 1 523, and then enters the exhaust pipe 3. During this process, the gas discharged along guide channel 1 523 pushes the blade 1 5221 on the surface of the blade pipe 522 to rotate, thus causing the blade pipe 522 to rotate. The rotation of the blade 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 remove the attached dust, forming radial cleaning. The relative motion and friction between the brush plate 525 and the screen 524 form axial cleaning. Figure 9 As shown ( Figure 9(The non-black solid arrows in the text indicate the gas flow path). Air inside the working face of the mining channel enters the air intake pipe 51 from the horn port of the intake pipe 51 and is filtered by the screen 524. At the same time, the screen 524 rotates continuously relative to the brush plate 525, so that the brush plate 525 can continuously clean the screen 524, reduce the risk of the screen 524 becoming blocked, and thus reduce the coal dust content entering the exhaust pipe 3, avoiding environmental pollution after the air with a high coal dust content is discharged.

[0042] See Figure 4 , Figure 5 , Figure 7 and Figure 8 The dust removal component 53 includes two rotating rings 531 that are rotatably disposed inside the air outlet pipe 3 and distributed vertically. Multiple leaf plates 537 are fixedly disposed on the lower side of each of the two rotating rings 531. Multiple dust removal strips 532 are inserted between the upper and lower rotating rings 531. The cleaning surface of the dust removal strips 532 is in contact with the inner wall of the air outlet pipe 3. A guide channel 533 is opened on the surface of the air outlet pipe 3 near the corresponding 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 below has multiple notches and slots, and the lower side of the ash removal strip 532 is inserted into the corresponding notch and slot. The upper edge of the rotating ring 531 located above has multiple notches and slots that penetrate its lower side, and the ash removal strip 532 is inserted into the corresponding notch and slot.

[0044] See Figure 4 , Figure 5 , Figure 7 , Figure 8 and Figure 9 A support ring 534 is fixedly installed on the inner wall of the lower end of the air outlet pipe 3. The upper side of the support ring 534 and the lower side of the lower blade 537 roll against each other through a ball bearing 535. The outer side of the rotating ring 531 rolls against the inner wall of the air outlet pipe 3 through a ball bearing 536.

[0045] In actual operation, the air in branch pipe 2 45 can also enter the guide channel 2 533 through branch pipe 3 54, and then enter the outlet pipe 3, such as... Figure 9As shown; during this process, after the air is discharged along the guide channel 2 533, it can drive the blade 2 537 to rotate, thereby causing the rotating ring 531 to 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 adhering to the inner wall of the air outlet pipe 3, and the scraped coal dust is discharged with the gas.

[0046] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A ventilation system for a coal mine working face mining passage, comprising an intake pipe, a transmission pipe, and an 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 delivery pipe, and the air inlet end of the air outlet pipe. A cleaning mechanism is provided on the air outlet pipe. The air distribution mechanism includes a three-way pipe fixedly connected to the air outlet end of the air inlet pipe. Valve assemblies are fixedly connected to both other ends of the three-way pipe. An air volume regulating component is provided between the two valve assemblies. Branch pipe one and branch pipe two are respectively connected to the two valve assemblies. The end of branch pipe one away from the corresponding valve assembly is fixedly connected to the air supply pipe. The end of branch pipe two 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 regulating component, which dynamically distributes the incoming air and allows some clean air to enter the auxiliary cleaning mechanism in the branch pipe to dilute the coal dust 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 shaped like a trumpet. The lower end of the second branch pipe is fixedly connected to the outer wall of the other end of the air intake pipe. A sieving component is installed inside the air intake pipe, and a dust removal component located above the sieving component is installed inside the air outlet pipe. Two third branch pipes are also fixedly installed on the second branch pipe and the air outlet pipe. The screening assembly includes a rotatable leaf tube and a fixed brush plate. A screen is fixedly installed at the air inlet port of the leaf tube, and the right side surface of the screen slides in contact with the brush plate. As the clean air in branch pipe 2 enters the outlet pipe through the intake pipe, it drives the screen to rotate relative to the brush plate. The brush plate continuously cleans the screen to achieve filtration and prevent clogging. 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. The valve assembly includes a rectangular housing that is fixedly connected to one end of a tee pipe. The two housings, on the side 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 housing near the air volume regulating assembly. Both sealing plates are connected to the air volume regulating assembly. The air volume regulating component includes a fixed base fixedly installed on the ground inside the mining channel. A rotating shaft is rotatably installed on the upper side of the fixed base via an ear plate. Three gears evenly distributed along the length direction are coaxially mounted on the outer side of the rotating shaft. A motor is fixedly installed on any one ear plate. The output shaft of the motor is fixedly connected to one end of the rotating shaft. Two toothed plates symmetrically arranged on the lower side of the sealing plate above the gears are fixedly installed. A toothed plate is fixedly installed in the middle of the right side of the sealing plate to the left of the gears. The two toothed plates and the toothed plate mesh with the corresponding gears respectively. A guide plate is slidably connected to the side of the toothed plate away from the gear. The lower side of the guide plate is fixedly connected to the upper side of the fixed seat. A T-shaped guide plate is also fixedly installed on the upper side of the fixed seat. The horizontal section of the guide plate is slidably connected to the lower side of the toothed plate.

2. The ventilation system for a coal mine working face retreat passage according to claim 1, characterized in that, The screening assembly also includes a fixed ring fixedly disposed inside the suction pipe. The leaf pipe is rotatably disposed inside the fixed ring. The leaf pipe includes a pipe body. Multiple leaf plates are fixedly disposed on the surface of the pipe body and evenly distributed along its circumference. A flow guide channel connecting the suction pipe and the branch pipe is opened on the surface of the suction pipe near the leaf pipe.

3. The ventilation system for a coal mine working face retreat passage according to claim 2, characterized in that, A connecting plate is slidably provided on the left side of the screen. The upper and lower sides of the connecting plate are fixedly connected to the inner side of the fixing ring. A connecting shaft is fixedly provided in the middle of the connecting plate and the middle of the brush plate. The connecting shaft is rotatably connected to the center position of the screen.

4. The ventilation system for a coal mine working face recovery passage according to claim 1, characterized in that, The dust removal assembly includes two rotating rings rotatably disposed inside the air outlet pipe and distributed vertically. Multiple blades are fixedly disposed on the lower side of each of the two rotating rings. Multiple dust removal strips are inserted between the upper and lower rotating rings. The cleaning surface of the dust removal strips is in contact with the inner wall of the air outlet pipe. A guide channel is provided on the surface of the air outlet pipe near the corresponding blade. There are two guide channels in total. The port of the branch pipe is fixedly connected to the air outlet pipe and extends into the corresponding guide channel.

5. A ventilation system for a coal mine working face recovery passage according to claim 4, characterized in that, The upper edge of the lower rotating ring has multiple notches and slots, and the lower side of the ash removal strip is inserted into the corresponding notch and slot. The upper edge of the upper rotating ring has multiple notches and slots that penetrate its lower side, and the ash removal strip is inserted into the corresponding notch and slot.

6. A ventilation system for a coal mine working face recovery passage according to claim 4, characterized in that, A support ring is fixedly installed on the lower inner wall of the air outlet pipe. The upper side of the support ring and the lower side of the lower blade plate 2 are in rolling contact through a ball bearing 1. The outer side of the rotating ring and the inner wall of the air outlet pipe are in rolling contact through a ball bearing 2.

7. A ventilation system for a coal mine working face recovery passage according to claim 1, characterized in that, The surface of the gas pipeline is provided with a number of exhaust pipes along its length, and the exhaust pipes are equipped with on / off valves.

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