Gas extraction device for upper corner of fully mechanized coal mining face and use method thereof

Abstract

The application discloses a gas extraction device for upper corner of fully mechanized working face and a use method thereof. The device prolongs the gas inlet path by cooperating the sealing box with the communication side plate, slows down the inlet flow rate, is beneficial to the dust screen to block and isolate the coal dust, and makes the coal dust fall into the coal falling pipe for collection and cleaning. The device is characterized in that it is composed of a main body assembly, a suction assembly and a coal falling assembly. The main body assembly is composed of a suction cylinder, a water diversion groove, a lifting ring, a sealing box, an isolation inlet groove, a suction partition plate, a side communication groove, a suction groove, an outlet groove, a main suction cavity, an auxiliary suction cavity and a communication side plate. Two groups of lifting rings are arranged on the suction cylinder. One group of lifting rings is composed of multiple lifting rings. The suction cylinder is in a semi-cylindrical structure. The suction cylinder is open at both ends. The lifting rings are arranged on the planar side wall of the suction cylinder. The two groups of lifting rings are respectively arranged on the two sides of the planar side wall of the suction cylinder. The multiple lifting rings in the same group are equidistantly distributed along the length direction of the suction cylinder.

Description

Technical Field

[0001] This invention relates to a gas extraction device and its method for extracting gas from the upper corner of a fully mechanized mining face. It belongs to the field of underground gas treatment technology, and specifically relates to an extraction device and its method for being hoisted at the upper corner of a fully mechanized mining face to extract the gas accumulated in the upper corner into the return airway. Background Technology

[0002] During coal mining, the goaf near the longwall face typically contains a large amount of methane gas. The upper corner, located at the junction of the working face and the retreat roadway, is prone to methane accumulation due to poor ventilation. This accumulation creates eddies that are difficult to expel, and when the methane concentration exceeds a certain level, it can easily lead to safety accidents. Therefore, it is necessary to extract the methane from the upper corner. This is usually done by drilling holes in the upper part of the goaf to install methane extraction pipelines, and then using a suction pump to remove the accumulated methane from the upper corner. During gas extraction, a large amount of coal dust floats in the working face during fully mechanized mining. Therefore, during gas extraction, the coal dust and gas are extracted into the extraction pipeline together. As the coal dust moves with the gas in the extraction pipeline, it is easily blocked at the corners of the extraction pipeline and gradually adheres and accumulates on the inner wall of the pipeline, causing partial or complete blockage of the pipeline, which affects the normal operation of gas extraction. At the same time, since the extraction pipeline is buried, the coal dust accumulated in the pipeline is not easy to clean, making it difficult to unclog the pipeline.

[0003] CN205743985U discloses a gas drainage device for the upper corner of the working face, which includes an adjacent roadway installed in the working face. Multiple boreholes are installed from the adjacent roadway to the upper corner of the working face. A casing is buried in the borehole, and a control valve is installed on the casing. The casing is connected to a compressed air ejector device. During the gas drainage process, coal dust and gas are drawn into the drainage pipeline together. The dust is easily blocked at the corner of the drainage pipeline and accumulates on the inner wall of the pipeline, causing partial or complete blockage of the pipeline, which affects the normal operation of gas drainage. At the same time, since the drainage pipeline is buried, the coal dust accumulated in the pipeline is not easy to clean, and it is difficult to unclog the pipeline.

[0004] Publication number CN211116104U discloses a high-efficiency gas extraction device for the upper corner of a longwall face, including a mobile riser extraction device for the goaf and a temporary sealing device for the goaf with an expansion airbag. The mobile riser extraction device for the goaf includes an extraction pipe extending from the return airway into the goaf. The extraction pipe is equipped with a tee, with the two ends of the tee located on the horizontal plane connected to the extraction pipe respectively. During the gas extraction process, coal dust and gas are extracted into the extraction pipeline together, which is easily blocked at the corners of the extraction pipeline and accumulates on the inner wall of the pipeline, causing partial or complete blockage of the pipeline, affecting the normal operation of gas extraction. At the same time, since the extraction pipeline is buried, the coal dust accumulated in the pipeline is not easy to clean, and it is difficult to unclog the pipeline. Summary of the Invention

[0005] To improve the above situation, the present invention provides a gas extraction device and its method of use for the upper corner of a fully mechanized mining face. This device extends the gas intake path by using a sealed box in conjunction with a connecting side plate, slows down the intake airflow, facilitates the blocking and isolation of coal dust by a dustproof net, and allows the coal dust to fall into the coal chute for easy collection and cleaning.

[0006] The gas extraction device for the upper corner of a fully mechanized mining face according to the present invention is implemented as follows: The gas extraction device for the upper corner of a fully mechanized mining face according to the present invention consists of a main component, a suction component, and a coal cutting component.

[0007] The main component consists of a suction cylinder, a water inlet channel, a lifting ring, a sealing box, an isolation air inlet channel, a suction baffle, a side connecting channel, a suction through channel, an air outlet channel, a main suction chamber, an auxiliary suction chamber, and a connecting side plate.

[0008] The suction cylinder has two sets of lifting rings, each set consisting of multiple lifting rings.

[0009] Preferably, the suction cylinder has a semi-cylindrical structure with openings at both ends.

[0010] Preferably, the lifting rings are located on the planar sidewall of the suction cylinder, and two sets of lifting rings are located on both sides of the planar sidewall of the suction cylinder, with multiple lifting rings in the same set being equidistantly distributed along the length of the suction cylinder.

[0011] The middle part of the flat sidewall of the suction cylinder is recessed inward to form a water inlet groove.

[0012] Preferably, the water inlet trough is located at one end to six-sevenths of the length of the suction cylinder, the water inlet trough has a rectangular cross-section, and the width of the water inlet trough gradually decreases from the opening to the bottom.

[0013] The sealing box is placed inside the suction cylinder, and the sealing box is connected to the planar side wall of the suction cylinder.

[0014] Preferably, the sealing box has a cuboid structure, with the sealing box located near the other end of the suction cylinder, and the bottom of the sealing box parallel to the bottom of the water inlet trough.

[0015] The bottom of the sealed box has multiple suction channels, which are equidistantly distributed along the length of the bottom of the sealed box.

[0016] The suction channel is equipped with a dustproof mesh.

[0017] The sealed box has two internal connecting side plates. One side of each connecting side plate is connected to the flat side wall of the suction cylinder, and the other side is connected to the bottom of the sealed box.

[0018] Preferably, the two connecting side plates are symmetrically distributed within the sealed box.

[0019] The two connecting side plates divide the sealed box into a main suction chamber and an auxiliary suction chamber.

[0020] Preferably, there are two auxiliary suction chambers, which are located on either side of the main suction chamber. The width of each auxiliary suction chamber is smaller than the width of the main suction chamber.

[0021] The connecting side plate has multiple side connecting slots, which are equidistantly distributed along the length of the connecting side plate. Each side connecting slot is equipped with a dustproof mesh.

[0022] The suction baffle is placed inside the suction cylinder.

[0023] Preferably, the suction baffle is located at the junction of the bottom of the sealed box and the side wall of the water inlet trough.

[0024] The suction baffle divides the suction cylinder into an air inlet slot and an air outlet slot. The air outlet slot extends from one end of the suction baffle to the suction cylinder, while the air inlet slot extends from the other end of the suction baffle to the suction cylinder.

[0025] The suction assembly consists of a suction connecting pipe and a suction pump.

[0026] The suction pump is placed inside the air outlet trough.

[0027] The suction connection pipe is placed on the suction pump. The end of the suction connection pipe connected to the suction pump extends horizontally for a certain distance in the air outlet groove, then bends vertically upwards, passes through the bottom of the water inlet groove, and extends into the water inlet groove. Subsequently, it bends horizontally, passes through the side wall of the water inlet groove, and extends into the main suction chamber.

[0028] The coal feeding assembly consists of a coal feeding pipe and a solenoid valve.

[0029] The coal chute is placed on the suction cylinder.

[0030] Preferably, the coal drop pipe is located near the other end of the suction cylinder.

[0031] The coal drop pipe passes through the arc-shaped side wall of the suction cylinder and extends into the isolation air intake slot.

[0032] The solenoid valve is placed on the coal chute;

[0033] This invention also relates to a method of using a gas extraction device in the upper corner of a fully mechanized mining face, comprising the following steps:

[0034] 1. The gas extraction device at the upper corner of the fully mechanized mining face is suspended on the hook on the roof of the roadway by the lifting ring, so that one end of the suction cylinder is tilted downward and connected to the return airway, and the isolation air inlet groove at the other end of the suction cylinder is located in the upper corner area of ​​the fully mechanized mining face.

[0035] 2. Start the suction pump in the suction cylinder to intermittently extract the gas in the upper corner area, suck the gas into the isolation air intake groove, enter the main suction chamber and auxiliary suction chamber through the suction channel at the bottom of the sealed box, and then suck it into the suction pump through the suction connection pipe in the main suction chamber, and discharge it into the return air roadway from the outlet groove.

[0036] 3. During the suction process, the coal dust sucked into the isolation air intake trough falls into the coal drop pipe at the bottom of the isolation air intake trough under the obstruction of the dust net. After the suction pump stops, the solenoid valve is opened to allow the coal dust to fall out of the coal drop pipe for collection and cleaning.

[0037] Preferably, the solenoid valve is in the closed state during the suction process of the suction pump.

[0038] 4. At the same time, the water diversion channel can collect and guide the dripping water and fallen gravel seeping from the roof of the tunnel, so that it flows from one end of the suction cylinder to the side wall of the tunnel, and is then drained into the drainage ditch through the side wall of the tunnel. Beneficial effects

[0039] First, it can extend the gas intake path, slow down the intake airflow rate, and facilitate the dust screen to block and isolate coal dust, preventing coal dust from accumulating and clogging in the suction connection pipe, thus affecting the extraction process.

[0040] Second, the isolated coal dust can fall into the coal chute, making it easy to collect and clean.

[0041] Third, it can collect and divert dripping water and falling gravel from the tunnel roof through the water diversion channel, preventing the suction cylinder and suction pump from being corroded and damaged. Attached Figure Description

[0042] Figure 1 This is a three-dimensional structural diagram of a gas extraction device for the upper corner of a fully mechanized mining face according to the present invention;

[0043] Figure 2 This is a three-dimensional structural diagram of a gas extraction device for the upper corner of a fully mechanized mining face according to the present invention, which only shows the structure of the water diversion channel;

[0044] Figure 3 This is a schematic diagram of the structure of a gas extraction device at the upper corner of a fully mechanized mining face according to the present invention;

[0045] Figure 4 This is a three-dimensional structural diagram of a gas extraction device for the upper corner of a fully mechanized mining face according to the present invention, which only shows the structure of the main suction chamber.

[0046] Attached Figure

[0047] The components are: 1. Suction cylinder; 2. Water inlet trough; 3. Lifting ring; 4. Suction connection pipe; 5. Sealing box; 6. Isolation air inlet trough; 7. Coal drop pipe; 8. Solenoid valve; 9. Suction baffle; 10. Side connecting trough; 11. Suction through trough; 12. Suction pump; 13. Air outlet trough; 14. Main suction chamber; 15. Auxiliary suction chamber; 16. Connecting side plate. Detailed Implementation

[0048] The gas extraction device for the upper corner of a fully mechanized mining face according to the present invention is implemented as follows: it consists of a main component, a suction component, and a coal cutting component.

[0049] The main component consists of a suction cylinder 1, a water inlet trough 2, a lifting ring 3, a sealing box 5, an isolation air inlet trough 6, a suction baffle 9, a side connecting trough 10, a suction through trough 11, an air outlet trough 13, a main suction chamber 14, an auxiliary suction chamber 15, and a connecting side plate 16.

[0050] The suction cylinder 1 is equipped with two sets of lifting rings 3, and each set of lifting rings 3 consists of multiple lifting rings 3.

[0051] Preferably, the suction cylinder 1 has a semi-cylindrical structure, and both ends of the suction cylinder 1 are open.

[0052] Preferably, the lifting ring 3 is located on the planar sidewall of the suction cylinder 1, and the two sets of lifting rings 3 are respectively located on both sides of the planar sidewall of the suction cylinder 1. Multiple lifting rings 3 within the same set are equidistantly distributed along the length of the suction cylinder 1.

[0053] The suction cylinder 1 has a recessed center on its planar sidewall to form a water inlet groove 2.

[0054] Preferably, the water inlet trough 2 is located at one end to six-sevenths of the length of the suction cylinder 1. The cross-section of the water inlet trough 2 is rectangular, and the width of the water inlet trough 2 gradually decreases from the opening to the bottom.

[0055] The sealing box 5 is placed inside the suction cylinder 1, and the sealing box 5 is connected to the planar side wall of the suction cylinder 1.

[0056] Preferably, the sealing box 5 has a cuboid structure, and the bottom of the sealing box 5 is parallel to the bottom of the water inlet tank 2, located near the other end of the suction cylinder 1.

[0057] The bottom of the sealed box 5 has multiple suction channels 11, which are equidistantly distributed along the length of the bottom of the sealed box 5.

[0058] The suction channel 11 is equipped with a dustproof net.

[0059] The sealed box 5 has two internal connecting side plates 16. One side of each connecting side plate 16 is connected to the flat side wall of the suction cylinder 1, and the other side is connected to the bottom of the sealed box 5.

[0060] Preferably, the two connecting side plates 16 are symmetrically distributed within the sealed box 5.

[0061] The two connecting side plates 16 divide the sealed box 5 into a main suction chamber 14 and an auxiliary suction chamber 15.

[0062] Preferably, there are two auxiliary suction chambers 15, which are located on both sides of the main suction chamber 14. The width of each auxiliary suction chamber 15 is smaller than the width of the main suction chamber 14.

[0063] The connecting side plate 16 has multiple side connecting slots 10, which are equidistantly distributed along the length of the connecting side plate 16. Each side connecting slot 10 has a built-in dustproof mesh.

[0064] The suction baffle 9 is placed inside the suction cylinder 1.

[0065] Preferably, the suction baffle 9 is located at the junction of the bottom of the sealed box 5 and the side wall of the water inlet trough 2.

[0066] The suction baffle 9 divides the suction cylinder 1 into an isolation inlet groove 6 and an outlet groove 13. The outlet groove 13 is located at one end of the suction baffle 9 to the suction cylinder 1, and the inlet groove 6 is located at the other end of the suction baffle 9 to the suction cylinder 1.

[0067] The suction assembly consists of a suction connecting pipe 4 and a suction pump 12.

[0068] The suction pump 12 is placed inside the air outlet 13.

[0069] The suction connection pipe 4 is placed on the suction pump 12. The suction connection pipe 4 extends horizontally for a certain distance in the air outlet groove 13 from the end connected to the suction pump 12, then bends vertically upward and passes through the bottom of the water inlet groove 2 to enter the water inlet groove 2. Then it bends horizontally and passes through the side wall of the water inlet groove 2 to enter the main suction chamber 14.

[0070] The coal feeding assembly consists of a coal feeding pipe 7 and a solenoid valve 8.

[0071] The coal drop pipe 7 is placed on the suction cylinder 1.

[0072] Preferably, the coal drop pipe 7 is located near the other end of the suction cylinder 1.

[0073] The coal drop pipe 7 passes through the arc-shaped side wall of the suction cylinder 1 and extends into the isolation air intake slot 6.

[0074] Solenoid valve 8 is placed on coal chute 7;

[0075] Preferably, the dustproof net is made of high-density polyethylene material and is a flexible net woven by a special process;

[0076] This invention also relates to a method of using a gas extraction device in the upper corner of a fully mechanized mining face, comprising the following steps:

[0077] 1. The gas extraction device at the upper corner of the fully mechanized mining face is suspended on the hook on the roof of the roadway by the lifting ring 3, so that one end of the suction cylinder 1 is tilted downward and connected to the return airway, and the isolation air inlet groove 6 at the other end of the suction cylinder 1 is located in the upper corner area of ​​the fully mechanized mining face.

[0078] 2. Start the suction pump 12 in the suction cylinder 1 to intermittently extract the gas in the upper corner area, suck the gas into the isolation air intake groove 6, and enter the main suction chamber 14 and auxiliary suction chamber 15 through the suction channel 11 at the bottom of the sealed box 5. Then, it is sucked into the suction pump 12 through the suction connecting pipe 4 in the main suction chamber 14 and discharged into the return airway from the gas outlet groove 13.

[0079] 3 During the suction process of the suction pump 12, the coal dust sucked into the isolation air intake trough 6 falls into the coal drop pipe 7 at the bottom of the isolation air intake trough 6 under the obstruction of the dust net. After the suction pump 12 stops, the solenoid valve 8 is opened so that the coal dust falls out of the coal drop pipe 7 for collection and cleaning.

[0080] Preferably, the solenoid valve 8 is in the closed state during the suction process of the suction pump 12.

[0081] Preferably, the coal chute 7 is fixed to one side of the roadway by a clip, and the coal chute 7 is connected to a collection box on one side of the roadway.

[0082] 4 At the same time, the water channel 2 can collect and guide the dripping water and falling gravel seeping from the roof of the tunnel, so that it flows from one end of the suction cylinder 1 to the side wall of the other side of the tunnel, and is then drained into the drainage ditch through the side wall of the tunnel.

[0083] The suction cylinder 1 is designed with a semi-cylindrical structure, which facilitates the collection of coal dust that falls into the air by the arc-shaped isolation air inlet groove 6, so that it accumulates in the coal drop pipe 7, making it easier to open the solenoid valve 8 to discharge the coal dust during the extraction gap.

[0084] The lifting ring 3 is located on the side wall of the suction cylinder 1. The two sets of lifting rings 3 are located on both sides of the side wall of the suction cylinder 1. The design of multiple lifting rings 3 in the same set being equidistantly distributed along the length of the suction cylinder 1 can make the lifting of the suction cylinder 1 more stable and prevent the suction cylinder 1 from being blown and swayed by the airflow of the fully mechanized mining face, which could easily lead to the risk of falling.

[0085] The water diversion channel 2 is located at one end to six-sevenths of the suction cylinder 1. The cross-section of the water diversion channel 2 is rectangular. The design of the water diversion channel 2, which gradually decreases in width from the opening to the bottom, can prevent the accumulation of gravel in the water diversion channel 2 and blockage of the water diversion channel 2 when collecting and diverting dripping water and falling gravel from the roof of the tunnel, thus preventing water accumulation and easy corrosion of the suction cylinder 1.

[0086] There are two auxiliary suction chambers 15, which are located on both sides of the main suction chamber 14. The design of the auxiliary suction chamber 15 being narrower than the main suction chamber 14 allows for flow diversion. After the gas enters the sealed box 5, the gas intake distance is extended, so the gas first enters the auxiliary suction chamber 15, then the main suction chamber 14, and is then drawn into the suction connecting pipe 4. This allows the dustproof nets on the suction channel 11 and the side connecting channel 10 to provide double blocking and isolation of coal dust in the gas, resulting in better coal dust isolation.

[0087] The design of the suction baffle 9 located at the junction of the bottom of the sealed box 5 and the side wall of the water inlet trough 2 can separate and isolate the air inlet trough 6 and the air outlet trough 13, preventing the mixing of gas before and after coal dust isolation and affecting the coal dust isolation effect.

[0088] The design of the coal drop pipe 7 near the other end of the suction cylinder 1 allows the coal drop pipe 7 to be located below the sealing box 5, so that the blocked and isolated coal dust can fall directly into the coal drop pipe 7 after being collected through the isolation air inlet 6, which is convenient for collection and cleaning.

[0089] The dustproof net is made of high-density polyethylene material and is designed to be flexible through a special process. During the suction interval, the flexible dustproof net will rebound due to the lack of wind suction, shaking the coal dust attached to the dustproof net into the coal chute 7, preventing the dustproof net from being blocked and affecting gas extraction.

[0090] The sealed box 5, in conjunction with the connecting side plate 16, can extend the gas intake path, slow down the intake airflow speed, and facilitate the dustproof net to block and isolate coal dust.

[0091] The suction channel 11, the side connecting channel 10 and the dustproof net work together to provide double blocking and isolation of coal dust in the gas, resulting in better coal dust isolation effect.

[0092] The isolation air inlet 6, in conjunction with the coal drop pipe 7, allows the isolated coal dust to fall into the coal drop pipe 7 for easy collection and cleaning.

[0093] The purpose is to extend the gas intake path through the sealed box 5 and the connecting side plate 16, slow down the intake airflow, facilitate the dustproof net to block and isolate coal dust, and make the coal dust fall into the coal drop pipe 7 for easy collection and cleaning.

[0094] It should be noted that, unless otherwise explicitly specified and limited, the terms "placed," "connected," and "linked" should be interpreted broadly. For example, they can refer to fixed connections such as folded edges, rivets, pins, adhesives, and welds; detachable connections such as threaded connections, snap-fit ​​connections, and hinges; integral connections; electrical connections; direct connections; or indirect connections via an intermediate medium; or internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0095] The above embodiments are preferred embodiments of the present invention. To save space, the applicant has not added other embodiments, but this is not intended to limit the scope of the present invention. Any person skilled in the art can make some modifications without departing from the scope of the present invention; that is, all equivalent modifications made in accordance with the present invention should be covered by the scope of the present invention.

Claims

1. A gas extraction device for the upper corner of a fully mechanized mining face, characterized in that: The gas extraction device at the upper corner of the fully mechanized mining face consists of a main component, a suction component, and a coal cutting component. The main component comprises a suction cylinder, a water inlet trough, lifting rings, a sealing box, an isolation air inlet trough, a suction baffle, a side connecting trough, a suction through trough, an air outlet trough, a main suction chamber, an auxiliary suction chamber, and a connecting side plate. Two sets of lifting rings are mounted on the suction cylinder, each set consisting of multiple lifting rings. The center of the plane sidewall of the suction cylinder is recessed inward to form a water inlet trough. The sealing box is placed inside the suction cylinder and connected to the plane sidewall of the suction cylinder. The sealing box has a cuboid structure. The sealing box is located near the other side of the suction cylinder. At the end, the bottom of the sealed box is parallel to the bottom of the water inlet trough. Multiple suction channels are formed in the bottom of the sealed box, equidistantly distributed along the length of the bottom. Dustproof nets are installed inside each suction channel. The sealed box contains two connecting side plates, one side of which connects to the flat side wall of the suction cylinder, and the other side connects to the bottom of the sealed box. The two connecting side plates are symmetrically distributed within the sealed box, dividing it into a main suction chamber and an auxiliary suction chamber. Multiple side connecting grooves are formed on the connecting side plates, extending along the length of the connecting side plates. The components are evenly distributed. The side connecting grooves are equipped with dustproof nets. Suction baffles are placed inside the suction cylinder, dividing it into an air inlet groove and an air outlet groove. One end of the suction baffle to the suction cylinder is the air outlet groove, and the other end is the air inlet groove. The suction assembly consists of a suction connecting pipe and a suction pump. The suction pump is placed in the air outlet groove, and the suction connecting pipe is placed on the suction pump. The suction connecting pipe extends horizontally a certain distance within the air outlet groove from its end connected to the suction pump, then bends vertically upwards, passes through the bottom of the water inlet groove, and extends into the water inlet groove. It then bends horizontally again, passes through the side wall of the water inlet groove, and extends into… Inside the main suction chamber, the coal cutting assembly consists of a coal cutting pipe and a solenoid valve. The coal cutting pipe is placed on the suction cylinder, with its end near the other end of the suction cylinder. The coal cutting pipe extends through the arc-shaped sidewall of the suction cylinder into the isolation air intake groove. The solenoid valve is sleeved on the coal cutting pipe. There are two auxiliary suction chambers, located on either side of the main suction chamber. The width of the auxiliary suction chambers is smaller than that of the main suction chamber, allowing for gas diversion. This extends the gas intake distance after the gas enters the sealed box, facilitating the dust screen's ability to block and isolate coal dust. The operation of the above-mentioned gas extraction device at the upper corner of the fully mechanized mining face includes the following steps: 1) The gas extraction device at the upper corner of the fully mechanized mining face is suspended on the hook on the roof of the roadway by the lifting ring, so that one end of the suction cylinder is tilted downward and connected to the return airway, and the isolation air inlet groove at the other end of the suction cylinder is located in the upper corner area of ​​the fully mechanized mining face. 2) Start the suction pump in the suction cylinder to intermittently extract the gas in the upper corner area, suck the gas into the isolation air intake groove, enter the main suction chamber and auxiliary suction chamber through the suction channel at the bottom of the sealed box, and then suck it into the suction pump through the suction connection pipe in the main suction chamber, and discharge it into the return airway from the outlet groove. 3) During the suction process of the suction pump, the coal dust sucked into the isolation air intake trough falls into the coal drop pipe at the bottom of the isolation air intake trough under the obstruction of the dust net. After the suction pump stops, the solenoid valve is opened to allow the coal dust to fall out of the coal drop pipe for collection and cleaning. The solenoid valve is in the closed state during the suction process of the suction pump. 4) At the same time, the water diversion channel can collect and guide the dripping water and fallen gravel seeping from the roof of the tunnel, so that it flows from one end of the suction cylinder to the side wall of the tunnel, and is then drained into the drainage ditch through the side wall of the tunnel.

2. A gas extraction device for the upper corner of a fully mechanized mining face according to claim 1, characterized in that... The suction cylinder has a semi-cylindrical structure with openings at both ends, which facilitates the collection of coal dust by the arc-shaped isolation air inlet groove.

3. A gas extraction device for the upper corner of a fully mechanized mining face according to claim 1, characterized in that... The lifting rings are located on the side wall of the suction cylinder. Two sets of lifting rings are located on both sides of the side wall of the suction cylinder. Multiple lifting rings in the same set are equidistantly distributed along the length of the suction cylinder, which can make the lifting of the suction cylinder more stable and prevent the suction cylinder from being blown and swayed by the airflow of the fully mechanized mining face.

4. A gas extraction device for the upper corner of a fully mechanized mining face according to claim 1, characterized in that... The water diversion channel is located at one end to six-sevenths of the suction cylinder. The cross-section of the water diversion channel is rectangular. The width of the water diversion channel gradually decreases from the opening to the bottom. This allows for the collection and diversion of dripping water and falling gravel from the tunnel roof, while preventing gravel from accumulating in the water diversion channel and clogging it, thus preventing water seepage from accumulating.

5. A gas extraction device for the upper corner of a fully mechanized mining face according to claim 1, characterized in that... The suction baffle is located at the junction of the bottom of the sealed box and the side wall of the water inlet trough, which can separate and isolate the air inlet trough and the air outlet trough to prevent the gas from mixing before and after passing through the coal dust isolation.

6. A gas extraction device for the upper corner of a fully mechanized mining face according to claim 1, characterized in that... The dustproof net is made of high-density polyethylene material and is a flexible net woven by a special process. During the suction interval, the flexible dustproof net will rebound due to the lack of wind suction, shaking the coal dust attached to the dustproof net into the coal chute and preventing the dustproof net from being blocked.

7. A gas extraction device for the upper corner of a fully mechanized mining face according to claim 1, characterized in that... The sealed box, together with the connecting side plate, can extend the gas intake path, slow down the intake airflow speed, and facilitate the dustproof net to block and isolate coal dust.

8. A gas extraction device for the upper corner of a fully mechanized mining face according to claim 6, characterized in that... The dustproof net, suction channel, and side connecting channel work together to provide double protection and isolation of coal dust in the gas, resulting in better coal dust isolation.

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