A ventilation system for a coal mine underground recovery working face

Abstract

This invention discloses a ventilation system for underground coal mine longwall faces, belonging to the field of mine ventilation technology. The ventilation system includes a main intake pipe; the inner wall of the intake pipe has an annular array of arc-shaped mounting grooves, and an intake guide plate that can be inserted into the arc-shaped mounting grooves is provided at the port of the intake pipe. The intake guide plate guides the introduced airflow at the intake pipe port, forming a vortex-like airflow inside the intake pipe; a narrowing pipe chamber is connected to the rear side of the intake pipe, and an enlargement pipe chamber is connected to the side of the narrowing pipe chamber away from the intake pipe; a settling main chamber is connected to the bottom of the enlargement pipe chamber, and a scraper main component is rotatably connected inside the settling main chamber. This invention reduces the cost of the ventilation system and can greatly reduce the amount of dust remaining in the pipe, reducing the difficulty of subsequent cleaning of the pipe.

Description

Technical Field

[0001] This invention belongs to the field of mine ventilation technology, specifically a ventilation system for underground coal mining faces. Background Technology

[0002] A mine shaft is a general term for the tunnels, chambers, equipment, surface buildings, and structures that form an underground coal mine production system. Sometimes, inclined shafts, vertical shafts, and adits in underground mine development are also referred to as mine shafts. Mine ventilation refers to the process of introducing fresh air into the mine to increase the oxygen concentration, thereby diluting and expelling toxic and harmful gases and dust from the mine. The basic tasks of mine ventilation are: to supply sufficient fresh air underground to meet the oxygen needs of personnel, to dilute harmful gases and dust underground, to ensure safe production, to regulate the underground climate, and to create a good working environment. In order to ensure that the underground airflow flows and is distributed along a designated route, it is necessary to construct structures in certain roadways to guide and control the airflow, namely ventilation facilities. These facilities are divided into those that guide airflow and those that isolate airflow.

[0003] For underground ventilation, the main air duct and the secondary air duct are usually independent and run in parallel. The main air duct and the secondary air duct can be connected in series or in parallel. When it is necessary to introduce fresh air from the main air duct into the secondary air duct, a fan needs to be placed in the branch roadway. In the main air duct, part of the air force is introduced into the branch pipe through the diversion pipe and then transmitted to the fan in the branch roadway and discharged.

[0004] However, since the air in the secondary duct is drawn from the main duct, a lot of dust and impurities will inevitably remain in the drawn air. This means that a filter device needs to be installed at the end of the secondary duct, which increases the cost. In addition, dust is easy to remain in the duct, so the duct needs to be regularly maintained and cleaned in order to maintain the ventilation quality. Summary of the Invention

[0005] This invention overcomes the shortcomings of existing technologies and proposes a ventilation system for underground coal mine working faces; this invention is achieved through the following technical solution:

[0006] A ventilation system for an underground coal mine longwall face includes a main intake pipe and a ventilation fan. The inner wall of the main intake pipe has an annular array of arc-shaped mounting grooves, and an intake guide plate is provided at the end of the main intake pipe that can be inserted into the arc-shaped mounting grooves. The intake guide plate has an arc-shaped structure, and its outer wall can be inserted and adapted to the arc-shaped mounting grooves. A guide plate mounting frame is fixedly connected to the front end of the intake guide plate, and the end of the guide plate mounting frame is detachably connected to the main intake pipe. The intake guide plate guides the introduced airflow at the intake pipe opening, forming a vortex-like airflow within the main intake pipe.

[0007] A narrowing chamber is connected to the rear side of the main drainage pipe. An enlargement chamber is connected to the side of the narrowing chamber away from the main drainage pipe. A turning pipe is connected to the end of the enlargement chamber. A connecting turning component is connected to the end of the turning pipe. The end of the connecting turning component is connected to the ventilation fan. The inner diameter of the narrowing chamber is smaller than the inner diameter of the main drainage pipe and the enlargement chamber. The inner diameter of the enlargement chamber is greater than or equal to the inner diameter of the main drainage pipe.

[0008] The bottom of the enlarged chamber is connected to the main settling chamber, and the bottom of the main settling chamber is fixedly connected to the settling bottom chamber. A scraper main component is rotatably connected inside the main settling chamber, and the scraper main component is used to scrape and clean the inner wall of the main settling chamber.

[0009] Furthermore, the side wall of the main drainage pipe is provided with a guide plate positioning hole, and the end of the guide plate mounting bracket is provided with a mounting hole that is connected to the guide plate positioning hole by bolts; the mounting hole at the guide plate mounting bracket is aligned with the guide plate positioning hole and connected by bolts.

[0010] Furthermore, a rotating shaft is longitudinally installed inside the main settling chamber. The outer wall of the rotating shaft is rotatably connected to a horizontal bar rotating block via a shaft crossbar. The end of the shaft crossbar is rotatably connected to the horizontal bar rotating block via a rotating shaft. At the same time, an insertion cylinder is fixedly connected to the surface of the horizontal bar rotating block. A scraper main component is provided on one side of the horizontal bar rotating block. A positioning protrusion that is inserted into the insertion cylinder is fixedly connected to the surface of the scraper main component. The positioning protrusion has a multi-faceted hole shape, and the insertion cylinder that matches it is a multi-faceted prism. A drive motor is fixedly connected to the outside of the main settling chamber. The output end of the drive motor is connected to a motor belt. The other side of the motor belt is connected to the rotating shaft. The bottom end of the rotating shaft connected to the motor belt passes through the settling chamber and protrudes downwards.

[0011] Furthermore, positioning mounting holes are provided on the surfaces of the positioning protrusion and the insertion tube. After the insertion tube is fully inserted into the positioning protrusion, the positioning mounting holes are locked with bolts.

[0012] Furthermore, a set of rubber scraper strips are respectively provided on both sides of the surface of the scraper main component, and the rubber scraper strips are tightly fitted to the inner wall of the settling main chamber; a scraper groove is opened at the center of the surface of the scraper main component, and an adjusting scraper is slidably connected in the groove; a secondary rubber strip is connected to one side of the adjusting scraper, and a guide rail rod is fixedly connected to the surface of the adjusting scraper; the top opening of the settling main chamber is corrugated, and an adjusting guide rail groove is opened on the inner wall of the top opening of the settling main chamber, and the end of the guide rail rod extends into the adjusting guide rail groove.

[0013] Furthermore, the side of the settling silo is provided with a silo discharge port, and a dust collection pipe is inserted into the pipe opening of the silo discharge port. The surface of the dust collection pipe is connected to a dust collection bin, and a filter screen and air purification components are installed on the top of the dust collection bin.

[0014] Furthermore, two sets of assembly plates are symmetrically arranged outside the discharge port of the bottom silo, each set of assembly plates including two assembly plates distributed vertically; the surface of the dust collection connecting pipe is fixedly connected with mating blocks corresponding to the two sets of assembly plates; the dust collection connecting pipe is inserted into the discharge port of the bottom silo, so that the mating blocks are located between the corresponding set of assembly plates, and the longitudinal openings on the surface of the assembly plates and the mating blocks are connected by bolts.

[0015] Furthermore, the inner wall of the connecting pipe of the steering component is provided with a steering internal thread, the pipe opening of the steering pipe is provided with a mating ring, the inner wall of the mating ring is provided with an annular groove that is rotatably connected to the steering pipe, the outer side of the mating ring is provided with an external thread that meshes with the steering internal thread, and the end of the steering pipe is provided with an annular protrusion that extends into the annular groove.

[0016] Furthermore, a protective front cover is installed at the inlet of the main drainage pipe, and a cover support frame is connected to the top of the protective front cover, which is connected to the well wall; the surface of the protective front cover has a downward inclined structure.

[0017] Furthermore, an arc-shaped support plate is attached to the outer wall of the drainage main pipe, and an installation plate is fixedly connected to the end of the arc-shaped support plate. An adjustment plate is slidably attached to one side of the installation plate. Insertion holes with longitudinal spacing are opened on the surface of the installation plate and the adjustment plate. Bolts are inserted into different insertion holes to adjust the connection length of the installation plate and the adjustment plate, and to connect the adjustment plate to the well wall.

[0018] The beneficial effects of this invention compared to the prior art are as follows:

[0019] This invention features a detachable guide plate at the inlet of the main drainage pipe. This guide plate causes the air entering the main drainage pipe to form a vortex within the pipe. Dust mixed in with the air can then be moved along the inner wall of the main settling chamber and collected there. This replaces the larger dust collection system located at the end of the ventilation fan, reducing the cost of the ventilation system. It also significantly reduces the amount of dust remaining in the pipe, making subsequent cleaning of the pipe easier.

[0020] The present invention has a set of rotatable rotating shafts in the main settling chamber, so that the scraper main component connected to the rotating shafts can rotate on the inner wall of the main settling chamber and move along the inner wall of the main settling chamber. This can scrape off the dust remaining on the inner wall of the main settling chamber, reduce dust residue, improve dust collection and discharge efficiency, and the detachable dust collection chamber facilitates the timely discharge of stored dust, reducing cleaning difficulty. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is an enlarged side view of the main drainage pipe of the present invention;

[0023] Figure 3 This is an enlarged view of the drainage guide plate of the present invention;

[0024] Figure 4 This is an exploded view of the arc-shaped mounting groove and the flow guide plate of the present invention;

[0025] Figure 5 This is a cross-sectional view of the steering tube and the connecting steering component of the present invention.

[0026] Figure 6 This is a split view of the main settling chamber and the rotating shaft of the present invention;

[0027] Figure 7 This is an exploded view of the insertion cylinder and the positioning protrusion of the present invention;

[0028] Figure 8 This is an enlarged view of the rubber scraper of the present invention;

[0029] Figure 9 This is a diagram showing the separation between the dust collection connecting pipe and the bottom silo discharge port of the present invention;

[0030] Figure 10 This is an enlarged view of the opening of the discharge port in the bottom silo of the present invention.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Main drainage pipe; 2. Diverting pipe; 3. Connecting diverting component; 4. Ventilation fan; 5. Protective front cover plate; 6. Cover plate support frame; 7. Narrowing pipe chamber; 8. Expanding pipe chamber; 9. Arc-shaped support plate; 10. Mounting upright plate; 11. Adjusting upright plate section; 12. Arc-shaped mounting groove; 13. Guide plate positioning hole; 14. Drainage guide plate; 15. Guide plate mounting frame; 16. Annular slide groove; 17. Connecting ring; 18. Diverting internal thread; 19. Settling main chamber; 20. Drive motor; 21. Motor belt; 22. Rotating shaft; 23. 24. Crossbar; 25. Crossbar rotating block; 26. Positioning protrusion; 27. Insertion cylinder; 28. Scraper main component; 29. ​​Rubber scraper strip; 30. Scraper slide groove; 31. Adjusting scraper; 32. Secondary rubber strip; 33. Adjusting guide rail groove; 34. Guide rail insertion rod; 35. Positioning mounting hole; 36. Hanging ring; 37. Spring part; 38. Settling hopper; 39. Hydration outlet; 40. Dust collection hopper; 41. Dust collection connecting pipe; 42. Connecting block; 43. Assembly plate; 44. Filter screen; 45. Air purification component. Detailed Implementation

[0033] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0034] See Figures 1 to 10 This embodiment proposes a ventilation system for an underground coal mine working face, including a main drainage pipe 1 and a ventilation fan 4. The inner wall of the main drainage pipe 1 has an annular array of arc-shaped mounting grooves 12, and a drainage guide plate 14, which can be inserted into the arc-shaped mounting grooves 12, is provided at the port of the main drainage pipe 1. The drainage guide plate 14 has an arc-shaped structure, and its outer wall can be inserted and adapted to the arc-shaped mounting grooves 12. Simultaneously, a guide plate positioning hole 13 is provided on the side wall of the main drainage pipe 1, and the front end of the drainage guide plate 14... A guide plate mounting bracket 15 is fixedly connected. The end of the guide plate mounting bracket 15 is provided with a mounting hole that is connected to the guide plate positioning hole 13 by bolts. After the drainage guide plate 14 is installed, in order to improve the installation stability of the drainage guide plate 14, the mounting hole at the guide plate mounting bracket 15 is aligned with the guide plate positioning hole 13, and the two are reinforced together with bolts to maintain the stability of the position of the drainage guide plate 14. The drainage guide plate 14 can guide the introduced airflow at the inlet of the drainage main pipe 1, thereby forming a vortex-shaped airflow in the drainage main pipe 1.

[0035] An arc-shaped support plate 9 is attached to the outer wall of the main drainage pipe 1. An installation plate 10 is fixedly connected to the end of the arc-shaped support plate 9. An adjustment plate part 11 is slidably attached to one side of the installation plate 10. Insertion holes with longitudinal spacing are opened on the surface of the installation plate 10 and the adjustment plate part 11. By inserting bolts into different insertion holes, the connection length of the installation plate 10 and the adjustment plate part 11 can be adjusted, thereby adjusting the position of the main drainage pipe 1 from the top wall of the mine. The height of the main drainage pipe 1 can be adjusted according to the actual installation requirements.

[0036] Since the inlet of the main drainage pipe 1 faces the direction of airflow movement in the main air duct, large impurities may remain in the airflow of the main air duct. In order to prevent impurities from entering and causing damage to the equipment and generating noise, a protective front cover plate 5 is installed at the inlet of the main drainage pipe 1. The top of the protective front cover plate 5 is connected to a cover plate support frame 6, which is connected to the well wall. The surface of the protective front cover plate 5 is designed to be inclined downward. The protective front cover plate 5 is fitted over the inlet of the main drainage pipe 1. Large impurities mixed in the airflow will slide down the inclined surface of the protective front cover plate 5 when they encounter it. At the same time, the protective front cover plate 5 also provides a certain degree of safety protection.

[0037] A narrowing chamber 7 is connected to the rear side of the main drainage pipe 1. An expanding chamber 8 is connected to the side of the narrowing chamber 7 furthest from the main drainage pipe 1. A turning pipe 2 is connected to the end of the expanding chamber 8, and a connecting turning component 3 is connected to the end of the turning pipe 2. The end of the connecting turning component 3 is connected to a ventilation fan 4. The inner diameter of the narrowing chamber 7 is smaller than the inner diameters of the main drainage pipe 1 and the expanding chamber 8, while the inner diameter of the expanding chamber 8 is greater than or equal to the inner diameter of the main drainage pipe 1. In this embodiment, the narrowing chamber 7 has a structure that is narrower in the middle and wider at both ends. After the vortex-shaped air enters the main drainage pipe 1, it sequentially enters the narrowing chamber 7 and then the expanding chamber 8. The narrowing chamber 7 is narrower, followed by the expanding chamber 8. The larger internal space allows for better control of flow velocity, pressure, and flow stability. When strong eddies in narrow channels suddenly expand into the larger space, the eddy size increases but the intensity decreases, and the flow becomes smoother. This avoids noise and vibration caused by the superposition of small-scale eddies. Within the expanded tube chamber 8, deceleration and pressurization are achieved through cross-sectional expansion. The flow velocity in the larger channel decreases, and the inertial force is reduced, making it easier for carried particles such as dust and water droplets to settle or separate. At the bottom of the expanded tube chamber 8, a settling main chamber 19 is connected to the inside of the expanded tube chamber 8, allowing dust to enter the settling main chamber 19 for settling and separation from the air, thereby improving the quality of the air entering the ventilation fan 4.

[0038] Specifically, an arc transition is provided at the corner of the inner wall of the main diversion pipe 1 to improve the smoothness of airflow. The connecting and turning component 3 is set at the corner connection. The inner wall of the connecting and turning component 3 is provided with a turning internal thread 18. The pipe opening of the turning pipe 2 is provided with a connecting ring 17. The inner wall of the connecting ring 17 is provided with an annular groove 16 that is rotatably connected to the turning pipe 2. The outer part of the connecting ring 17 is provided with an external thread that meshes with the turning internal thread 18. The end of the turning pipe 2 is provided with an annular protrusion that extends into the annular groove 16 and slides. After the connecting ring 17 is operated to connect its external thread with the turning internal thread 18, the turning pipe 2 and the connecting and turning component 3 can be connected. The airflow turning pipe 2 and the connecting and turning component 3 are finally introduced to the ventilation fan 4, and the ventilation fan 4 transmits the airflow to the branch roadway.

[0039] A settling chamber 37 is fixedly connected to the bottom of the main settling chamber 19. A rotating shaft 22 is longitudinally installed inside the main settling chamber 19. A crossbar rotating block 24 is rotatably connected to the outer wall of the rotating shaft 22 via a shaft crossbar 23. The end of the shaft crossbar 23 is rotatably connected to the crossbar rotating block 24 via a rotating shaft. At the same time, an insertion cylinder 26 is fixedly connected to the surface of the crossbar rotating block 24. A scraper main component 27 is provided on one side of the crossbar rotating block 24. A positioning element that is inserted and connected to the insertion cylinder 26 is fixedly connected to the surface of the scraper main component 27. The positioning protrusion 25 has a multi-faceted hole shape, and the matching insertion cylinder 26 is also a multi-faceted prism. By inserting the insertion cylinder 26 and the positioning protrusion 25 at different angles, a certain inclination angle can be achieved between the rotating shaft 22 and the scraper main component 27. The positioning protrusion 25 and the insertion cylinder 26 are also provided with positioning mounting holes 34. After the insertion cylinder 26 is fully inserted into the positioning protrusion 25, the positioning mounting holes 34 are locked with bolts to strengthen the connection strength between the crossbar rotating block 24 and the positioning protrusion 25. A drive motor 20 is fixedly connected to the outside of the main settling chamber 19. The output end of the drive motor 20 is connected to a motor belt 21. The other side of the motor belt 21 is connected to a rotating shaft 22. The bottom end of the rotating shaft 22, which is connected to the motor belt 21, passes through the settling chamber 37 and protrudes downwards. The drive motor 20 drives the motor belt 21, which in turn drives the rotating shaft 22 to rotate. The rotating shaft 22 drives the crossbar rotating block 24 to rotate, which in turn drives the scraper main component 27 to rotate. This can perform a scraping and cleaning action on the inner wall of the main settling chamber 19 to prevent the settled dust from adhering to the inner wall of the main settling chamber 19.

[0040] A set of rubber scraper strips 28 are respectively provided on both sides of the surface of the scraper main component 27. When the scraper main component 27 moves in a circular motion within the settling main chamber 19, in order to improve the scraping and cleaning force on the inner wall of the settling main chamber 19, the two sets of rubber scraper strips 28 are installed alternately on one side of the scraper main component 27, so that the rubber scraper strips 28 are in close contact with the inner wall of the settling main chamber 19. A scraper groove 29 is provided at the center of the surface of the scraper main component 27, and an adjusting scraper 30 is slidably connected in the groove of the scraper groove 29. A secondary rubber strip 31 is connected to one side of the settling main chamber 19, and a guide rail rod 33 is fixedly connected to the surface of the adjusting scraper 30. The top opening of the settling main chamber 19 is corrugated, and an adjusting guide rail groove 32 is provided on the inner wall of the top opening of the settling main chamber 19. The end of the guide rail rod 33 extends into the adjusting guide rail groove 32. Through the rotational connection between the shaft crossbar 23 and the crossbar rotating block 24, the guide rail rod 33 can always be kept moving within the adjusting guide rail groove 32, thereby cleaning the top opening of the settling main chamber 19.

[0041] Hanging rings 35 are installed on the surfaces of the shaft crossbar 23 and the scraper main component 27. A spring part 36 is connected between the hanging rings 35 on the shaft crossbar 23 and the hanging rings 35 on the scraper main component 27. Through the elastic action of the spring part 36, elastic support force can be provided for the scraper main component 27, further enhancing the scraping and cleaning quality of the inner wall of the settling main chamber 19.

[0042] The settling chamber 37 has a bottom discharge port 38 on its side. A dust collection connecting pipe 40 is inserted into the opening of the bottom discharge port 38. A dust collection bin 39 is connected to the surface of the dust collection connecting pipe 40. A filter screen 43 and an air purification component 44 are installed on the top of the dust collection bin 39. It is worth noting that the opening angle of the bottom discharge port 38 can be inclined, making it easier for dust to be introduced from the bottom discharge port 38 into the dust collection bin 39 on one side. The lower part of the dust collection bin 39 has a transparent structure, which facilitates the observation of the amount of dust inside.

[0043] Two sets of mounting plates 42 are symmetrically arranged outside the discharge port 38 of the bottom silo. Each set of mounting plates 42 includes two mounting plates 42 distributed vertically. The surface of the dust collection connecting pipe 40 is fixedly connected with mating blocks 41 corresponding to the two sets of mounting plates 42. The dust collection connecting pipe 40 is inserted into the discharge port 38 of the bottom silo, so that the mating blocks 41 are located between the corresponding set of mounting plates 42. The longitudinal openings on the surfaces of the mounting plates 42 and the mating blocks 41 are connected by bolts.

[0044] This embodiment presents the working principle of a ventilation system for underground coal mine longwall faces:

[0045] Since the arc-shaped support plate 9 is fixedly connected to the outside of the main drainage pipe 1, the connection between the main drainage pipe 11 and the mine wall is adjusted by the insertion holes with longitudinal spacing on the surface of the mounting plate 10 and the adjusting plate part 11. By inserting bolts into different insertion holes, the connection length between the mounting plate 10 and the adjusting plate part 11 can be adjusted, thereby adjusting the position of the main drainage pipe 1 from the mine roof. The height of the main drainage pipe 1 can be adjusted according to the actual installation requirements.

[0046] Next, the protective front cover plate 5 is assembled in front of the main drainage pipe 1, so that the cover plate support frame 6 on the top of the protective front cover plate 5 is connected to the well wall. The protective front cover plate 5 is fitted over the pipe opening of the main drainage pipe 1, and the surface of the protective front cover plate 5 is designed to be inclined downwards, so that larger impurities can slide off along the inclined surface of the protective front cover plate 5. At the same time, the protective front cover plate 5 provides a certain degree of safety protection. Then, the outer wall of the drainage guide plate 14 is inserted and fitted into the arc-shaped mounting groove 12. After the drainage guide plate 14 is installed, in order to improve the installation stability of the drainage guide plate 14, the mounting bracket 15 at the guide plate mounting point is installed. The hole is aligned with the guide plate positioning hole 13, and the two are reinforced together with bolts to maintain the stability of the position of the guide plate 14. The guide plate 14 can guide the introduced airflow at the inlet of the main guide pipe 1, thereby forming a vortex-shaped airflow in the main guide pipe 1. After the vortex-shaped airflow enters the main guide pipe 1, it enters the narrowing chamber 7 and the expanding chamber 8 in sequence. The narrowing chamber 7 is narrower, and the expanding chamber 8 has a larger internal space, which can better control the flow rate, pressure and flow stability, so that the dust enters the settling main chamber 19 for settling and separation from the air.

[0047] After the dust-laden airflow enters the main settling chamber 19, it is discharged into the dust collection chamber 39 from the bottom chamber discharge port 38 on the side of the settling bottom chamber 37. The airflow passes through the perforated filter screen 43 and is purified by the air purification component 44 before being discharged. The dust collection chamber 39 and the bottom chamber discharge port 38 adopt a quick-release design. The dust collection connecting pipe 40 is inserted into the pipe opening of the bottom chamber discharge port 38, and the mating block 41 is inserted between the two upper and lower distributed mounting plates 42. Then, the bolts are passed through the longitudinal openings on the surface of the mounting plate 42 and the mating block 41, and the connection is reinforced with nuts. Conversely, the nuts and bolts can be removed to dismantle the dust collection chamber 39 for cleaning.

[0048] To prevent dust from adhering to the inner wall of the settling main chamber 19, the drive motor 20 drives the motor belt 21, which in turn drives the rotating shaft 22 to rotate. This, in turn, moves the positioning protrusion 25 within the settling main chamber 19. The rubber scraper 28 and the auxiliary rubber strip 31 are designed to fit snugly against the inner wall of the settling main chamber 19. At the same time, the front end of the guide rail rod 33 can be inserted into the groove of the adjusting guide rail groove 32. When the scraper main component 27 rotates, the guide rail rod 33 moves as it is inserted into the track of the adjusting guide rail groove 32, which pulls the auxiliary rubber strip 31 and the adjusting scraper 30 to slide in the groove of the scraper slide groove 29. This adjusts the stretching length of the adjusting scraper 30 and the scraper main component 27, so that the top of the auxiliary rubber strip 31 can scrape the inner wall of the top opening of the settling main chamber 19 as much as possible, reducing any omissions.

[0049] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all of these should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A ventilation system for an underground coal mine working face, comprising a main drainage pipe (1) and a ventilation fan (4); characterized in that, The inner wall of the main pipe (1) is provided with an arc-shaped mounting groove (12) arranged in a ring array, and a guide plate (14) is provided at the port of the main pipe (1) that can be inserted into the arc-shaped mounting groove (12). The guide plate (14) has an arc surface structure, and the outer wall of the guide plate (14) can be inserted and adapted to the arc-shaped mounting groove (12). The front end of the guide plate (14) is fixedly connected to the guide plate mounting bracket (15), and the end of the guide plate mounting bracket (15) is detachably connected to the main pipe (1). The guide plate (14) guides the introduced airflow at the port of the main pipe (1) and forms a vortex-shaped airflow in the main pipe (1). A narrowing chamber (7) is connected to the rear side of the drainage main pipe (1). An enlargement chamber (8) is connected to the side of the narrowing chamber (7) away from the drainage main pipe (1). A turning pipe (2) is connected to the end of the enlargement chamber (8). A connecting turning component (3) is connected to the end of the turning pipe (2). The end of the connecting turning component (3) is connected to the ventilation fan (4). The inner diameter of the narrowing chamber (7) is smaller than the inner diameter of the drainage main pipe (1) and the enlargement chamber (8). The inner diameter of the enlargement chamber (8) is greater than or equal to the inner diameter of the drainage main pipe (1). The bottom of the enlarged chamber (8) is connected to the main settling chamber (19), and the bottom of the main settling chamber (19) is fixedly connected to the settling bottom chamber (37). The main settling chamber (19) is rotatably connected to the main settling chamber (19), and the main settling chamber (27) is used to scrape and clean the inner wall of the main settling chamber (19). A rotating shaft (22) is longitudinally installed inside the main settling chamber (19). The outer wall of the rotating shaft (22) is rotatably connected to a crossbar rotating block (24) via a shaft crossbar (23). The end of the shaft crossbar (23) is rotatably connected to the crossbar rotating block (24) via a rotating shaft. At the same time, a plug-in cylinder (26) is fixedly connected to the surface of the crossbar rotating block (24). A scraper main component (27) is provided on one side of the crossbar rotating block (24). The surface of the scraper main component (27) is fixedly connected to the plug-in cylinder. (26) A positioning protrusion (25) is inserted and connected, wherein the hole of the positioning protrusion (25) is a multi-faceted hole, and the plug-in cylinder (26) that is adapted to it is a multi-faceted prism; a drive motor (20) is fixedly connected to the outside of the main settling chamber (19), and a motor belt (21) is connected to the output end of the drive motor (20). The other side of the motor belt (21) is connected to the rotating shaft (22), wherein the bottom end of the rotating shaft (22) connected to the motor belt (21) passes through the settling chamber (37) and protrudes downward.

2. The ventilation system for an underground coal mine working face according to claim 1, characterized in that, The side wall of the drainage main pipe (1) is provided with a guide plate positioning hole (13), and the end of the guide plate mounting bracket (15) is provided with a mounting hole that is connected to the guide plate positioning hole (13) by bolts; the mounting hole at the guide plate mounting bracket (15) is aligned with the guide plate positioning hole (13) and connected by bolts.

3. The ventilation system for an underground coal mine working face according to claim 1, characterized in that, Positioning mounting holes (34) are provided on the surfaces of the positioning protrusion (25) and the insertion sleeve (26). After the insertion sleeve (26) is fully inserted into the positioning protrusion (25), the positioning mounting holes (34) are locked with bolts.

4. A ventilation system for an underground coal mine working face according to claim 1, characterized in that, A set of rubber scraper strips (28) are provided on both sides of the surface of the scraper main component (27). The rubber scraper strips (28) are tightly fitted to the inner wall of the settling main chamber (19). A scraper groove (29) is provided at the center of the surface of the scraper main component (27). An adjusting scraper (30) is slidably connected in the groove of the scraper groove (29). A secondary rubber strip (31) is connected to one side of the adjusting scraper (30). A guide rail rod (33) is fixedly connected to the surface of the adjusting scraper (30). The top opening of the settling main chamber (19) is corrugated. An adjusting guide rail groove (32) is provided on the inner wall of the top opening of the settling main chamber (19). The end of the guide rail rod (33) extends into the adjusting guide rail groove (32).

5. A ventilation system for an underground coal mine working face according to claim 1, characterized in that, The side of the settling silo (37) is provided with a silo discharge port (38), and a dust collection pipe (40) is inserted into the pipe opening of the silo discharge port (38). A dust collection silo (39) is connected to the surface of the dust collection pipe (40), and a filter screen (43) and an air purification component (44) are installed on the top of the dust collection silo (39).

6. A ventilation system for an underground coal mine working face according to claim 5, characterized in that, Two sets of mounting plates (42) are symmetrically arranged outside the pipe opening of the bottom silo discharge port (38). Each set of mounting plates (42) includes two mounting plates (42) distributed vertically. The surface of the dust collection connecting pipe (40) is fixedly connected with a mating block (41) corresponding to the two sets of mounting plates (42). The dust collection connecting pipe (40) is inserted into the pipe opening of the bottom silo discharge port (38), so that the mating block (41) is located between the corresponding set of mounting plates (42). The longitudinal openings on the surface of the mounting plates (42) and the mating block (41) are connected by bolts.

7. A ventilation system for an underground coal mine working face according to claim 1, characterized in that, The inner wall of the connecting steering component (3) is provided with a steering internal thread (18), the outer sleeve of the steering pipe (2) is provided with a docking ring (17), the inner wall of the docking ring (17) is provided with an annular groove (16) that is rotatably connected to the steering pipe (2), the outer side of the docking ring (17) is provided with an external thread that meshes with the steering internal thread (18), and the end of the steering pipe (2) is provided with an annular protrusion that extends into the annular groove (16).

8. A ventilation system for an underground coal mine working face according to claim 1, characterized in that, The drainage main pipe (1) is equipped with a protective front cover plate (5) at the pipe opening. The top of the protective front cover plate (5) is connected to a cover plate support frame (6), which is connected to the well wall through the cover plate support frame (6). The surface of the protective front cover plate (5) has a downward inclined structure.

9. A ventilation system for an underground coal mine longwall face according to claim 1, characterized in that, An arc-shaped support plate (9) is attached to the outer wall of the drainage main pipe (1). An installation plate (10) is fixedly connected to the end of the arc-shaped support plate (9). An adjustment plate part (11) is slidably attached to one side of the installation plate (10). Insertion holes with longitudinal spacing are opened on the surface of the installation plate (10) and the adjustment plate part (11). Bolts are inserted into different insertion holes to adjust the connection length of the installation plate (10) and the adjustment plate part (11). The adjustment plate part (11) is connected to the well wall.

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