A coal dust and gas removal device for a mining pneumatic drill and a method of using the same

Abstract

The present invention provides a coal dust and gas removal device for a mining pneumatic drill and a method for using the same. The device comprises a collecting device, a coal dust collector and a gas coal dust separator. The collecting device and the coal dust collector are connected to the gas coal dust separator through an extraction pipe. An air injection pipe is also connected between the collecting device and the gas coal dust separator. The coal dust collector is located below the collecting device and is connected to the collecting device through the coal dust pipe. By arranging air injection ports and air extraction ports around the drill rod, the gas generated by the drilling is timely extracted, and the coal dust is timely collected and separated. The dry separation technology is adopted, and there is no water vapor generated, the separation effect is better, the gas extraction efficiency is also relatively high, the dust removal effect is better, and the gas no longer exceeds the limit. The device adopts wind power as the power source, which reduces the trouble of special electricians pulling the wires before the equipment is started; the dust is centrally processed after separation, which reduces the workload of cleaning the tunnel after the drilling construction is completed, and the operation is simple and the efficiency is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine safety equipment, and more specifically, particularly relates to a coal dust and gas removal device for a mining pneumatic drill and a use method thereof. Background Art

[0002] Coal dust poses a great threat to the production, safety construction and health of coal miners in mines. Drilling is one of the most common methods for gas control. Drilling is often used to extract coal seam gas and measure gas-related parameters. Drilling is divided into water drilling and air drilling. Water drilling will form water accumulation, and pulverized coal slurry will be formed when coal powder is treated later, which is difficult to handle. In addition, if coal seam parameters need to be measured, the coal sample needs to be kept dry to ensure the accuracy of the data, so it is necessary to use air drilling for drilling. A large amount of coal dust is generated during the drilling process with air drills. The flying coal dust makes the mine working environment poor, visibility low, and construction operation difficult. Even if workers wear dust masks, they are still greatly injured. At the same time, it will also affect the safety of electrical equipment in the tunnel. During the drilling process, when the gas content in the coal seam is too high, the gas gas can easily migrate out through the cracks and pores of the surrounding coal body along the borehole, causing local gas to exceed the limit in the tunnel. At present, the dust reduction and dust removal measures taken by drilling in mines are mainly spray dust removal. The effect of spray dust removal is greatly affected by the type of dust and its wettability. It is often difficult to achieve the ideal dust removal effect with a single water mist. The dust removal effect is poor and the dust removal efficiency needs to be further improved. Spray cannot solve the problem of gas exceeding the limit. How to effectively prevent the occurrence of the above phenomenon is a technical problem that needs to be solved. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a coal dust and gas removal device for a mining pneumatic drill and a method of using the same. By arranging air injection ports and air exhaust ports around the drill rod, the gas generated by the drilling hole is timely extracted, and the coal powder is timely collected and separated. The method adopts dry separation technology, does not generate water vapor, has a better separation effect, has a relatively high gas extraction efficiency, has a better dust removal effect, and the gas no longer exceeds the limit, effectively solving the above-mentioned technical problems.

[0004] The purpose and effect of the coal dust and gas removal device for mining pneumatic drill and the use method thereof of the present invention are achieved by the following specific technical means:

[0005] A coal dust and gas removal device for a mining pneumatic drill comprises a collecting device, a coal dust collector and a gas-coal dust separator. The collecting device and the coal dust collector are connected to the gas-coal dust separator through an extraction pipe. An air injection pipe is also connected between the collecting device and the gas-coal dust separator. The coal dust collector is located below the collecting device and is connected to the collecting device through the coal dust pipe. By arranging air injection ports and air extraction ports around the drill rod, the gas generated by the drilling hole is timely extracted, and the coal dust is timely collected and separated. The method adopts dry separation technology, does not generate water vapor, has a better separation effect, has a relatively high gas extraction efficiency, has a better dust removal effect, and does not exceed the limit of gas.

[0006] The collecting device includes a bag and a shell, the bag is connected to the shell and covered on the drill pipe, the bag is connected to the water pressure pump through an injection pipe and a water injection valve, a baffle, a primary air injection ring and a secondary air injection ring are respectively provided on the inner side of the shell, and an air extraction port, a powder collecting port, a primary air injection port, a secondary air injection port and a gas concentration monitor are respectively provided on the outer wall of the shell, the powder collecting port is located at the bottom of the shell and connected to the coal powder pipe, the air extraction port is located at the top of the shell and connected to the extraction pipe, the primary air injection port and the secondary air injection port are respectively connected to the primary air injection ring and the secondary air injection ring and communicate with the air injection pipe.

[0007] During the drilling process, coal powder and gas enter the inner cavity of the collection device through the gap between the drill hole and the drill rod. The dust enters the cavity first, and the granular dust collides with the baffle and stays in the first layer of the cavity, and enters the coal powder collector through the powder collecting port. The other end of the coal powder collector is connected to the extraction pipeline to provide power for the coal powder to enter the coal powder collector.

[0008] Most of the coal powder is retained in the first layer, and a small amount of coal and gas enter the second layer. The second layer is the first-level air injection ring, which is a hollow structure with high-pressure air flowing inside. The gas forms an air curtain after passing through the outlet, so that the coal powder and gas are blocked in the second layer, and there is a circular opening between the first and second layers, and the extraction pipe is connected to the air extraction port to extract the coal powder and gas from the second layer; the third layer is the second-level air injection ring, which has a similar structure to the second layer, except that the distance between the outlet of the second-level air injection ring and the drill pipe is smaller, the air outlet is smaller, and the air curtain blown out is stronger; a gas concentration monitor is installed on the outside of the device to detect the treatment effect of the device. When the gas concentration exceeds the standard, the device alarms, and it is necessary to adjust the air intake and exhaust valves of the device to achieve a qualified coal dust and gas removal effect.

[0009] The gas-coal powder separator includes a plurality of centrifugal dust collectors arranged side by side, which are connected in series through pipelines. A secondary powder locking device is provided at the bottom of the centrifugal dust collector, and a horizontal belt is provided below the secondary powder locking device. A blade fan is connected to the end of the belt through a sprocket and a chain, and the blade fan is connected to the gas injection pipe. A plurality of rollers are provided on the belt. A horizontal pipe is connected in the tangential direction of the top side of the first-stage centrifugal dust collector, and the horizontal pipe is connected to the extraction pipe. A main extraction pipe is connected in the middle of the top of the last-stage centrifugal dust collector.

[0010] The two-stage powder locking device consists of two baffles. One end of the paddle is connected to a spring to provide pulling force. Under normal circumstances, the baffle is in a horizontal closed position. When the weight of the upper coal dust exceeds a certain value, the baffle automatically opens, the coal dust falls, the weight decreases, and the baffle automatically returns to its position. The use of two-stage baffles can realize automatic coal discharge of the device, causing the extraction pipeline to extract ambient air.

[0011] The gas injection pipe first passes through the blade fan in the gas-coal powder separation device to drive the blades to rotate. The blade shaft and the roller shaft of the belt are connected by a sprocket chain to drive the belt to rotate. The gas-coal powder mixed gas collected by the coal powder collector and the collection device is introduced into the three-stage centrifugal dust collector for centrifugal separation to achieve gas-solid separation. The separated coal powder falls onto the belt through the secondary powder locking device. The belt transports the coal powder out of the device, and the gas enters the mine extraction network through the pipeline.

[0012] The coal powder collector is a box structure, which is connected to the coal powder pipe at the top of the coal powder collector. A powder locking device is provided at the bottom of the coal powder collector, and the upper side wall of the coal powder collector is also connected to the extraction pipe through an extraction valve.

[0013] After the coal powder enters the coal powder collector, larger particles of coal powder settle to the bottom of the device and are separated from the outlet by a baffle, allowing more coal powder to settle inside the device. There is a powder locking device at the bottom of the device, which consists of two baffles. One end of the baffle is connected to a spring to provide pulling force. Under normal circumstances, the baffle is in a horizontal closed position. When the weight of the upper coal dust exceeds a certain value, the baffle automatically opens, the coal dust falls, the weight decreases, and the baffle automatically returns to its position. The use of two-stage baffles can realize automatic coal discharge of the device, causing the extraction pipeline to extract ambient air.

[0014] The main extraction pipe is provided with a main extraction valve.

[0015] The extraction pipe is provided with extraction valves at different positions, which is convenient to control according to production needs.

[0016] The gas injection pipe is respectively provided with an inlet valve and an outlet valve, and the blade blower is located between the inlet valve and the outlet valve.

[0017] The cross-sections of the primary air injection ring, the secondary air injection ring and the baffle are all arc-shaped structures. The primary air injection ring is located in the middle of the secondary air injection ring and the baffle. The primary air injection ring and the secondary air injection ring are both hollow structures with air outlets on the inside and are connected to the primary air injection port and the secondary air injection port on the outside respectively.

[0018] A method for using a coal dust and gas removal device for a mine pneumatic drill, the method comprising the following steps: 1. drilling a 1m hole in the tunnel section, cleaning the coal wall debris at the opening position, drilling a 1m deep hole with an expansion drill, retracting the drill, and cleaning the broken coal body near the hole; 2. placing a collecting device in the hole, adjusting the angle so that the powder collecting port faces downward; 3. connecting a water injection pipe to a water pressure pump, injecting water to expand the bag, so that the coal powder cannot enter the tunnel through the gap between the bag and the drill rod; 4. placing the collecting device in the hole, adjusting the angle so that the powder collecting port faces downward; 5. connecting a water injection pipe to a water pressure pump, injecting water to expand the bag, so that the coal powder cannot enter the tunnel through the gap between the bag and the drill rod; 6. placing the collecting device in the hole, adjusting the angle so that the coal powder cannot enter the tunnel through the gap between the bag and the drill rod; 7. placing the collecting device in the hole, adjusting the angle so that the coal powder cannot enter the tunnel through the gap between the bag and the drill rod; 8. placing the collecting device in the hole, adjusting the angle so that the coal powder cannot enter the tunnel through the gap between the bag and the drill rod; 9. placing the collecting device in the hole, adjusting the angle so that the coal powder cannot enter the tunnel through the gap between the bag and the drill rod; 10. placing the collecting device in the hole, adjusting the angle so that the coal powder cannot enter the tunnel through the gap between the bag and the drill rod; 11. placing the collecting device in the hole, adjusting the angle so that the coal powder can enter the tunnel; 12. placing the collecting device in the hole, adjusting the angle so that the coal powder can enter the tunnel; 13. placing the collecting device in the hole, adjusting the angle so that the coal powder can enter the tunnel; 14. placing the collecting device in the hole, adjusting the angle so that the coal powder can enter the tunnel; 15. placing the collecting device in the hole, adjusting the angle 5. Connect the gas extraction port and coal powder collector to the gas coal powder separator through the extraction pipe, open the extraction valve, close the main extraction valve and connect the other end to the mine extraction network; 6. Connect the first-level gas injection port and the second-level gas injection port to the gas injection pipe respectively, open the outlet valve, close the inlet valve and connect the other end to the mine air duct; 7. Turn on the power of the gas concentration monitor, open the inlet valve and the main extraction valve, and start the drilling rig to start drilling.

[0019] Adjust the valves of each branch gas injection pipe and extraction pipe according to actual conditions to ensure that there is no dust overflow; clean up the coal powder at the outlet of the coal powder collector and the gas-coal powder separator in time; when the gas monitor alarms, stop drilling, adjust the valve of the extraction pipe to increase the extraction intensity, and continue drilling only after the alarm ends.

[0020] The present invention has at least the following beneficial effects:

[0021] By setting air injection ports and exhaust ports around the drill pipe, the gas generated by the drilling is timely extracted and the coal powder is timely collected and separated. This method adopts dry separation technology, no water vapor is generated, the separation effect is better, the gas extraction efficiency is also relatively high, the dust removal effect is better, and the gas no longer exceeds the limit. This device uses wind power as the power source, reducing the trouble of special electricians pulling wires before starting the equipment; dust is separated and processed centrally, reducing the workload of tunnel cleaning after the drilling construction is completed, with good effect, simple operation and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the collecting device of the present invention;

[0024] Figure 3 This is a view of the collecting device of the present invention taken along the direction of A;

[0025] Figure 4 It is a schematic diagram of the structure of the gas-coal powder separator of the present invention. DETAILED DESCRIPTION

[0026] The following examples are used to further describe the embodiments of the present invention. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0029] Example:

[0030] The present invention provides a coal dust and gas removal device for a mining pneumatic drill, as shown in the attached Figure 1-4 As shown, it includes a collecting device 2, a coal powder collector 12 and a gas coal powder separator 3. The collecting device 2 and the coal powder collector 12 are connected to the gas coal powder separator 3 through an extraction pipe 5. An air injection pipe 10 is also connected between the collecting device 2 and the gas coal powder separator 3. The coal powder collector 12 is located below the collecting device 2 and is connected to the collecting device 2 through a coal powder pipe 13. By arranging air injection ports and air extraction ports around the drill pipe, the gas generated by the borehole is extracted in time, and the coal powder is collected and separated in time. This method adopts dry separation technology, no water vapor is generated, the separation effect is better, the gas extraction efficiency is also relatively high, the dust removal effect is better, and the gas no longer exceeds the limit.

[0031] Further, as attached Figure 2-3As shown, the collecting device 2 includes a bag 1 and a shell 29, wherein the bag 1 is connected to the shell 29 and is covered on the drill pipe, and the bag 1 is connected to the water pressure pump 14 through the water injection pipe 16 and the water injection valve 15, and a baffle 21, a primary air injection ring 27 and a secondary air injection ring 26 are respectively provided on the inner side of the shell 29, and an air extraction port 22, a powder collecting port 28, a primary air injection port 23, a secondary air injection port 24 and a gas concentration monitor 25 are respectively provided on the outer wall of the shell 29, the powder collecting port 28 is located at the bottom of the shell 29 and is connected to the coal powder pipe 13, the air extraction port 22 is located at the top of the shell 29 and is connected to the extraction pipe 5, the primary air injection port 23 and the secondary air injection port 24 are respectively connected to the primary air injection ring 27 and the secondary air injection ring 26 and are connected to the air injection pipe 10.

[0032] During the drilling process, coal powder and gas enter the inner cavity of the collection device 2 through the gap between the drill hole and the drill rod. The dust first enters the cavity, and the granular dust collides with the baffle 21 and is retained in the first layer of the cavity, and enters the coal powder collector 12 through the powder collecting port 28. The other end of the coal powder collector 12 is connected to the extraction pipeline to provide power for the coal powder to enter the coal powder collector 12.

[0033] Most of the coal powder is retained in the first layer, and a small part of the coal body and gas enter the second layer. The second layer is the first-level air injection ring 27, which is a hollow structure with high-pressure air flowing inside. The gas forms an air curtain after passing through the outlet, so that the coal powder and gas are blocked in the second layer, and there is an annular opening between the first and second layers, and the extraction pipe is connected to the air extraction port to extract the coal powder and gas from the second layer; the third layer is the second-level air injection ring 26, which has a similar structure to the second layer, except that the distance between the outlet of the second-level air injection ring 26 and the drill pipe is smaller, the air outlet is smaller, and the air curtain blown out is stronger; a gas concentration monitor 25 is installed on the outside of the device to detect the treatment effect of the device. When the gas concentration exceeds the standard, the device alarms, and it is necessary to adjust the air intake and exhaust valves of the device to achieve a qualified coal dust-gas removal effect.

[0034] Further, as attached Figure 4 As shown, the gas-coal powder separator 3 includes a plurality of centrifugal dust collectors 34 arranged side by side, the centrifugal dust collectors 34 are connected in series through a pipeline 32, a secondary powder locking device 35 is provided at the bottom of the centrifugal dust collector 34, a horizontal belt 36 is provided below the secondary powder locking device 35, a blade fan 38 is connected to the end of the belt 36 through a sprocket and a chain 37, the blade fan 38 is connected to the gas injection pipe 10, a plurality of rollers 39 are provided on the belt 36, a horizontal pipe 31 is connected to the top side tangent direction of the first-stage centrifugal dust collector 34, the horizontal pipe 31 is connected to the extraction pipe 5, and an extraction main pipe 33 is connected to the top middle of the centrifugal dust collector 34 of the last stage.

[0035] The two-stage powder locking device 35 is composed of two baffles. One end of the paddle is connected to a spring to provide pulling force. Under normal circumstances, the baffle is in a horizontal closed position. When the weight of the upper coal dust exceeds a certain value, the baffle automatically opens, the coal dust falls, the weight decreases, and the baffle automatically returns to its position. The use of two-stage baffles can realize automatic coal discharge of the device, causing the extraction pipeline to extract ambient air.

[0036] The gas injection pipe 10 first passes through the blade fan 38 in the gas-coal powder separation device to drive the blades to rotate. The blade shaft is connected to the roller shaft of the belt 36 by a sprocket chain 37 to drive the belt to rotate. The gas-coal powder mixed gas collected by the coal powder collector 12 and the collection device 2 is introduced into the three-stage centrifugal dust collector 34 for centrifugal separation to achieve gas-solid separation. The separated coal powder falls onto the belt 36 through the two-stage powder locking device 35. The belt 36 transports the coal powder out of the device, and the gas enters the mine extraction network through the pipeline.

[0037] Furthermore, the coal powder collector 12 is a box structure, which is connected to the coal powder pipe 13 at the top of the coal powder collector 12, and a powder locking device 11 is provided at the bottom of the coal powder collector 12. The upper side wall of the coal powder collector 12 is also connected to the extraction pipe 5 through the extraction valve 4.

[0038] After the coal powder enters the coal powder collector 12, larger particles of coal powder settle to the bottom of the device and are separated from the outlet by a baffle, allowing more coal powder to settle inside the device. There is a powder locking device 11 at the bottom of the device, which consists of two baffles. One end of the baffle is connected to a spring to provide pulling force. Under normal circumstances, the baffle is in a horizontal closed position. When the weight of the upper coal dust exceeds a certain value, the baffle automatically opens, the coal dust falls, the weight decreases, and the baffle automatically returns to its position. The use of two-stage baffles can realize automatic coal discharge of the device, causing the extraction pipeline to extract ambient air.

[0039] Furthermore, a main extraction valve 7 is provided on the main extraction pipe 33 .

[0040] Furthermore, a drainage valve 4 is provided on the drainage pipe 5 .

[0041] Furthermore, an inlet valve 8 and an outlet valve 9 are respectively provided on the gas injection pipe 10 , and the blade fan 38 is located between the inlet valve 8 and the outlet valve 9 .

[0042] Furthermore, the cross-sections of the primary air injection ring 27, the secondary air injection ring 26 and the baffle 21 are all arc-shaped structures. The primary air injection ring 27 is located in the middle of the secondary air injection ring 26 and the baffle 21. The primary air injection ring 27 and the secondary air injection ring 26 are both hollow cavity structures with air outlets on the inside and are connected to the primary air injection port 23 and the secondary air injection port 24 on the outside, respectively.

[0043] A method for using a coal dust and gas removal device for a mine pneumatic drill, the method comprising the following steps: 1. drilling a 1m hole in a tunnel section, cleaning the coal wall debris at the opening position, drilling a 1m deep hole with an expansion drill, retracting the drill, and cleaning the broken coal body near the hole; 2. placing a collecting device 2 into the hole, adjusting the angle so that the powder collecting port 28 faces downward; 3. connecting a water injection pipe 16 to a water pressure pump 14, injecting water to expand a bag 1, so that the coal powder cannot enter the tunnel through the gap between the bag 1 and the drill rod; 4. connecting the collecting device 2 to the tunnel anchor Fix it with a rod anchor cable; 5. Connect the exhaust port 22 and the coal powder collector 12 to the gas coal powder separator 3 through the extraction pipe 5, and open the extraction valve 4, close the main extraction valve 7 and connect the other end to the mine extraction network; 6. Connect the first-level gas injection port 23 and the second-level gas injection port 24 to the gas injection pipe 10 respectively, open the outlet valve 9, close the inlet valve 8 and connect the other end to the mine air duct; 7. Turn on the power of the gas concentration monitor 25, open the inlet valve 8 and the main extraction valve 7, and start the drilling rig to start drilling.

[0044] Adjust the valves of the gas injection pipes and extraction pipes of each branch according to the actual situation to ensure that there is no dust overflow; clean the coal powder at the outlets of the coal powder collector 12 and the gas-coal powder separator 3 in time; when the gas monitor 25 alarms, stop drilling, adjust the valves of the extraction pipe to increase the extraction force, and continue drilling only after the alarm ends.

[0045] By setting air injection ports and exhaust ports around the drill pipe, the gas generated by the drilling is timely extracted and the coal powder is timely collected and separated. This method adopts dry separation technology, no water vapor is generated, the separation effect is better, the gas extraction efficiency is also relatively high, the dust removal effect is better, and the gas no longer exceeds the limit. This device uses wind power as the power source, reducing the trouble of special electricians pulling wires before starting the equipment; dust is separated and processed centrally, reducing the workload of tunnel cleaning after the drilling construction is completed, with good effect, simple operation and high efficiency.

[0046] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0047] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A coal dust and gas removal device for a mining pneumatic drill, characterized in that: It comprises a collecting device (2), a coal powder collector (12) and a gas coal powder separator (3); the collecting device (2) and the coal powder collector (12) are connected to the gas coal powder separator (3) via an extraction pipe (5); an air injection pipe (10) is also connected between the collecting device (2) and the gas coal powder separator (3); the coal powder collector (12) is located below the collecting device (2) and is connected to the collecting device (2) via the coal powder pipe (13); the collecting device (2) comprises a bag (1) and a shell (29); the bag (1) is connected to the shell (29) and is covered on a drill pipe; the bag (1) is connected to a water pressure pump via a water injection pipe (16) and a water injection valve (15). (14), a baffle (21), a primary air injection ring (27) and a secondary air injection ring (26) are respectively provided on the inner side of the shell (29), and an air extraction port (22), a powder collecting port (28), a primary air injection port (23), a secondary air injection port (24) and a gas concentration monitor (25) are respectively provided on the outer side wall of the shell (29), the powder collecting port (28) is located at the bottom of the shell (29) and is connected to the pulverized coal pipe (13), the air extraction port (22) is located at the top of the shell (29) and is connected to the extraction pipe (5), the primary air injection port (23) and the secondary air injection port (24) are respectively connected to the primary air injection ring (27) and the secondary air injection ring (26) and are communicated with the air injection pipe (10); The gas-coal powder separator (3) comprises a plurality of centrifugal dust collectors (34) arranged side by side, the centrifugal dust collectors (34) being connected in series via a pipeline (32), a secondary powder locking device (35) being provided at the bottom of the centrifugal dust collector (34), a horizontal belt (36) being provided below the secondary powder locking device (35), a blade fan (38) being connected to the end of the belt (36) via a sprocket and a chain (37), the blade fan (38) being connected to an air injection pipe (10), a plurality of rollers (39) being provided on the belt (36), a horizontal pipe (31) being connected in a tangential direction of the top side edge of the first-stage centrifugal dust collector (34), the horizontal pipe (31) being connected to an extraction pipe (5), and an extraction main pipe (33) being connected to the middle of the top of the last-stage centrifugal dust collector (34).

2. The coal dust and gas removal device for mining pneumatic drill according to claim 1 is characterized in that: The coal powder collector (12) is a box structure, and is connected to a coal powder pipe (13) at the top of the coal powder collector (12). A powder locking device (11) is provided at the bottom of the coal powder collector (12). The upper side wall of the coal powder collector (12) is also connected to an extraction pipe (5) via an extraction valve (4).

3. The coal dust and gas removal device for mining pneumatic drill according to claim 1 is characterized in that: The main extraction pipe (33) is provided with a main extraction valve (7).

4. The coal dust and gas removal device for mining pneumatic drill according to claim 1 is characterized in that: The extraction pipe (5) is provided with an extraction valve (4).

5. The coal dust and gas removal device for mining pneumatic drill according to claim 1 is characterized in that: An inlet valve (8) and an outlet valve (9) are respectively provided on the gas injection pipe (10), and the blade fan (38) is located between the inlet valve (8) and the outlet valve (9).

6. The coal dust and gas removal device for mining pneumatic drill according to claim 1 is characterized by: The cross-sections of the primary gas injection ring (27), the secondary gas injection ring (26) and the baffle (21) are all arc-shaped structures; the primary gas injection ring (27) is located between the secondary gas injection ring (26) and the baffle (21); the primary gas injection ring (27) and the secondary gas injection ring (26) are both hollow cavity structures, with air outlets on the inside and the outsides being connected to the primary gas injection port (23) and the secondary gas injection port (24) respectively.

7. The method for using the coal dust and gas removal device for a mining pneumatic drill according to any one of claims 1 to 6, characterized in that: The method comprises the following steps:

1. drilling a 1m hole in the tunnel section, cleaning the coal wall debris at the hole opening, drilling a 1m deep hole with an expansion drill, retracting the drill, and cleaning the broken coal body near the hole; 2. placing the collection device (2) in the hole, adjusting the angle so that the powder collecting port (28) faces downward; 3. connecting the water injection pipe (16) to the hydraulic pump (14), injecting water to expand the bag (1), so that the coal powder cannot enter the tunnel through the gap between the bag (1) and the drill rod; 4. fixing the collection device (2) to the tunnel anchor rod; 5. fixing the air extraction port (28) to the tunnel anchor rod; 2) and the coal powder collector (12) are connected to the gas coal powder separator (3) through the extraction pipe (5), and the extraction valve (4) is opened, the main extraction valve (7) is closed and the other end is connected to the mine extraction pipe network; six, the first-level gas injection port (23) and the second-level gas injection port (24) are respectively connected to the gas injection pipe (10), and the outlet valve (9) is opened, the inlet valve (8) is closed and the other end is connected to the mine air duct; seven, the power supply of the gas concentration monitor (25) is turned on, the inlet valve (8) and the extraction main valve (7) are opened, and the drilling rig can be started to start drilling.

Images