An automatic air curtain generation device during coal mine excavation

Abstract

The present invention relates to the technical field of coal mine excavation, and specifically to an automatic air curtain generation device during coal mine excavation. It comprises a mounting frame, a first air curtain generating mechanism, and a first dust extraction mechanism; the mounting frame comprises a first mounting cylinder and a second mounting cylinder arranged coaxially, the first air curtain generating mechanism comprises a first rotating cylinder and a fixed guide cylinder arranged between the first mounting cylinder and the second mounting cylinder, a plurality of first spiral blades are evenly distributed on the outer wall of the first rotating cylinder, the first spiral blades are located in a first exhaust cavity formed by the gap between the first rotating cylinder and the fixed guide cylinder, an annular air guide channel is installed on the outer wall of the first mounting cylinder away from the excavation side, and one end of the annular air guide channel is connected to a compressed air pump through an air guide pipe. The present invention can form a double air curtain, and dust can be isolated by the first air curtain and the second air curtain, which has a high isolation effect between the operator and the excavation area, a high safety factor, and strong operability.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine excavation, in particular to an automatic air curtain generating device during coal mine excavation. Background Art

[0002] With my country's growing demand for coal energy, not only has the number of coal mines increased, but fully mechanized tunneling technology has also rapidly developed. While fully mechanized tunneling technology increases working face advancement speed, it also significantly increases dust concentrations within the working face. According to field measurements, dust concentrations within fully mechanized tunneling working faces can reach as high as 5000 mg / m³, with respirable dust accounting for nearly 40%. Both total dust and respirable dust concentrations significantly exceed national safety standards.

[0003] Scholars at home and abroad have proposed using an "invisible transparent barrier" air curtain to control dust dispersion and have conducted relevant research and application. This system works by forming a dust-proof air curtain near the working face to prevent dust from spreading outward, and then extracting the dust-laden air through a suction pipe. With technological advancements, air curtain dust control technology has begun to be applied to fully mechanized excavation working faces in my country's coal mines. However, existing air curtain generators, both domestically and internationally, generally suffer from issues such as bulk, weight, complex operation, poor controllability, poor isolation effectiveness, and low safety factors. Summary of the Invention

[0004] Based on this, it is necessary to provide an automatic air curtain generation device during coal mine excavation to address the existing technical problems. The present invention can form multiple gas flow trajectories, so that most of the dust within the trajectory can be isolated by the first air curtain and the second air curtain, thereby achieving an isolation effect between the operator and the excavation area. It has a high safety factor, strong operability, and good isolation effect.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0006] The present invention provides an automatic air curtain generation device during coal mine excavation, comprising a mounting frame, a first air curtain generating mechanism and a first dust extraction mechanism; the mounting frame comprises a first mounting cylinder and a second mounting cylinder arranged coaxially, the second mounting cylinder being located outside the first mounting cylinder; the first dust extraction mechanism comprises an air extraction pipe coaxially arranged with the first mounting cylinder and installed in the first mounting cylinder, one end of the air extraction pipe points to the coal mine excavation position, and the other end of the air extraction pipe is connected to the air extraction pump; the first air curtain generating mechanism comprises a first rotating cylinder and a fixed guide cylinder arranged between the first mounting cylinder and the second mounting cylinder, the first rotating cylinder The cam is configured to move the first end of the first rotary cylinder to a position adjacent to the first support frame, the second end of the first rotary cylinder being configured to move the first end of the first rotary cylinder to a position adjacent to the first support frame.

[0007] Preferably, the outer wall of the first rotating drum is inclined, the diameter of the end of the first rotating drum close to the annular air guide channel is the smallest, and the diameter of the end of the first rotating drum away from the annular air guide channel is the largest. A conical avoidance groove for installing the first rotating drum and the first spiral blade is provided inside the fixed guide drum. The inclination angle of the inner wall of the conical avoidance groove is consistent with the inclination angle of the outer wall of the first rotating drum, and the outer wall of the first spiral blade fits into the inclined surface of the inner wall of the conical avoidance groove.

[0008] Preferably, a trumpet-shaped exhaust port is provided at one end of the exhaust pipe close to the excavation direction, and the trumpet-shaped exhaust port is fixedly connected to the end of the exhaust pipe.

[0009] Preferably, a plurality of first dust extraction holes are annularly arranged on the outer wall of the exhaust duct around its own axis.

[0010] Preferably, a telescopic drive mechanism is also included, which is arranged at the end of the mounting frame away from the excavation direction. The telescopic drive mechanism is connected to the exhaust pipe through transmission. The exhaust pipe can be slidably connected along the axis of the first mounting cylinder, and several annular first dust extraction holes are arranged in several rows in sequence along the length direction of the exhaust pipe.

[0011] Preferably, it also includes a second air curtain generating mechanism and a second dust extraction mechanism, both of which are installed on the outer side wall of the second mounting cylinder; the second dust extraction mechanism is located on the side of the second air curtain generating mechanism close to the excavation direction; the second air curtain generating mechanism includes a second rotating drum installed on the second mounting cylinder and capable of rotating around the axis of the second mounting cylinder, and a mounting plate installed on the outer side wall of the second mounting cylinder, the second rotating drum is located between the mounting plate and the annular air guide channel, a second exhaust cavity is provided in the second rotating drum, the second exhaust cavity includes a plurality of second spiral blades distributed in a ring around the axis of the second rotating drum, a first exhaust hole is provided on the outer side wall of the second rotating drum radially arranged along the second mounting cylinder, a plurality of first exhaust holes are provided, and the plurality of first exhaust holes are distributed in a ring around the axis of the second rotating drum, and the first exhaust hole is connected to the second exhaust cavity.

[0012] Preferably, the annular air guiding channel is connected to both the first exhaust cavity and the second exhaust cavity.

[0013] Preferably, the mounting plate is provided with second exhaust holes arranged along its axial direction, and a plurality of second exhaust holes are provided, and the plurality of exhaust holes are distributed in a ring around the axis of the second rotating drum.

[0014] Preferably, the second dust extraction mechanism includes an annular dust extraction chamber and a dust extraction pipe. The outer wall of the dust extraction chamber is provided with a plurality of second dust extraction holes distributed in a ring around the axis of the second mounting cylinder. One end of the dust extraction pipe is connected to the interior of the dust extraction chamber, and the other end of the dust extraction pipe is connected to the air pump.

[0015] Preferably, a side of the dust extraction chamber away from the second air curtain generating mechanism is provided with an inwardly inclined inclined surface, and the dust extraction hole is provided on the inclined surface.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The automatic air curtain generation device can be installed on the coal mine excavation equipment through the mounting frame. The air curtain generation work is synchronized with the coal mine excavation process, forming an invisible isolation air isolation area between the coal mine excavation area and the operator's working area, preventing the dust and gas generated in the excavation area from being inhaled by the operator, and can dilute the gas and collect the dust to achieve a safe production process.

[0018] 2. The air discharged from the first exhaust cavity forms a spiral air curtain that gradually expands outward, which expands the coverage of the air curtain, improves the isolation effect, and reduces the impact of the exhaust of the first dust extraction mechanism in the middle on the air curtain during exhaust, so that the air curtain can isolate wind and dust more completely, similar to the conical water curtain formed by spraying water during fire extinguishing.

[0019] 3. The second air curtain generating mechanism can form an air curtain on the vertical plane between the coal mine excavation area and the operator's operating area, that is, the second air curtain, and can blow the dust leaked from the first air curtain to the second dust extraction mechanism for further dust extraction, further improving the dust extraction isolation effect, preventing personnel from inhaling dust, improving the working environment, and improving the safety of coal mine excavation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of an automatic air curtain generation device during coal mine excavation;

[0021] Figure 2 It is a three-dimensional structural diagram of an automatic air curtain generating device during coal mine excavation;

[0022] Figure 3 It is a cross-sectional view of an automatic air curtain generating device during coal mine excavation;

[0023] Figure 4 It is a quarter-section view of an automatic air curtain generation device during coal mine excavation;

[0024] Figure 5 It is a three-dimensional exploded diagram of the first air curtain generating mechanism in the automatic air curtain generating device during coal mine excavation;

[0025] Figure 6 This is a schematic diagram of the gas flow direction of the first air curtain generating mechanism and the first dust extraction mechanism in the automatic air curtain generating device during coal mine excavation;

[0026] Figure 7 The present invention is a schematic diagram of the gas flow direction of the first air curtain generating mechanism and the first dust extraction mechanism, as well as the second air curtain generating mechanism and the second dust extraction mechanism in an automatic air curtain generating device during coal mine excavation;

[0027] Figure 8 The present invention is a three-dimensional structural diagram of a second air curtain generating mechanism and a second dust extraction mechanism in an automatic air curtain generating device during coal mine excavation.

[0028] The numbers in the figure are:

[0029] 1-Mounting frame;

[0030] 11-first installation cylinder;

[0031] 12- second mounting cylinder;

[0032] 2-first air curtain generating mechanism;

[0033] 21-first rotating drum;

[0034] 22-fixed guide cylinder; 221-cone-shaped avoidance groove;

[0035] 23-first spiral blade;

[0036] 24-first exhaust cavity;

[0037] 25-annular air guide channel;

[0038] 3-First dust extraction mechanism;

[0039] 31-exhaust pipe; 311-trumpet-shaped exhaust port; 312-first dust extraction hole;

[0040] 4- telescopic drive mechanism;

[0041] 5- Second air curtain generating mechanism;

[0042] 51-second rotating drum; 511-first exhaust hole;

[0043] 52-mounting plate; 521-second exhaust hole;

[0044] 53- Second exhaust cavity;

[0045] 54- second spiral blade;

[0046] 6- Second dust extraction mechanism;

[0047] 61-annular dust extraction chamber; 611-second dust extraction hole; 612-inclined surface;

[0048] 62-Dust extraction pipe. DETAILED DESCRIPTION

[0049] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] like Figure 1-Figure 4The device for automatically generating an air curtain during coal mine excavation shown in the figure includes a mounting frame 1, a first air curtain generating mechanism 2 and a first dust extraction mechanism 3; the mounting frame 1 includes a first mounting cylinder 11 and a second mounting cylinder 12 arranged coaxially, and the second mounting cylinder 12 is located outside the first mounting cylinder 11; the first dust extraction mechanism 3 includes an exhaust pipe 31 coaxially arranged with the first mounting cylinder 11 and installed in the first mounting cylinder 11, one end of the exhaust pipe 31 points to the coal mine excavation position, and the other end of the exhaust pipe 31 is connected to the exhaust pump; the first air curtain generating mechanism 2 includes a first rotating cylinder 21 and a fixed guide cylinder 22 arranged between the first mounting cylinder 11 and the second mounting cylinder 12, and the first rotating cylinder 21 can rotate It is dynamically installed on the outer wall of the first mounting cylinder 11, and the first rotating cylinder 21 and the fixed guide cylinder 22 are coaxially arranged with the first mounting cylinder 11. A number of first spiral blades 23 are evenly distributed on the outer wall of the first rotating cylinder 21. The first spiral blades 23 are located in the first exhaust cavity 24 formed in the gap between the first rotating cylinder 21 and the fixed guide cylinder 22, and the first spiral blades 23 are fixedly connected to the first rotating cylinder 21; an annular air guide channel 25 is installed on the outer wall of the first mounting cylinder 11 away from the excavation side, one end of the annular air guide channel 25 is connected to the compressed air pump through an air guide pipe, and the other end of the annular air guide channel 25 is connected to the first exhaust cavity 24 and is transmission-connected to the first rotating cylinder 21 through the first spiral blades 23.

[0051] The automatic air curtain generation device can be installed on the coal mine excavation equipment through the mounting frame 1, and the air curtain generation work can be synchronized with the coal mine excavation process, forming an invisible isolated air isolation area between the coal mine excavation area and the operator's working area, preventing the dust and gas generated in the excavation area from being inhaled by the operator, and can dilute the gas and collect the dust to achieve a safe production process.

[0052] The first air curtain generating mechanism 2 in the mounting frame 1 can blow the air in front of the coal mine excavation to form an annular air curtain area. When the compressed air is guided into the first exhaust cavity 24 formed between the first rotating drum 21 and the fixed guide drum 22 through the annular air guide channel 25, it is guided by a plurality of first spiral blades 23 fixedly connected to the first rotating drum 21. The compressed air drives the first spiral blades 23 to rotate around the axis of the first mounting drum 11, and then drives the first rotating drum 21 fixedly connected thereto to rotate, forming a spiral outward blowing air duct at the outlet of the first exhaust cavity 24, so that the blown wind is more The dust and gas generated during excavation can be extracted from the excavation area through the exhaust pipe 31 through the first dust extraction mechanism 3 in the first installation cylinder 11. At this point, the first air curtain generating mechanism 2 cooperates with the first dust extraction mechanism 3 to form a gas flow trajectory, so that most of the dust in the trajectory can be isolated by the first air curtain, so as to achieve the isolation effect between the operator and the excavation area, with a high safety factor, and the air curtain can be adjusted autonomously according to the wind force, with strong operability and good isolation effect.

[0053] like Figure 1-Figure 5 As shown, the outer wall of the first rotating drum 21 is arranged to be inclined, the diameter of the end of the first rotating drum 21 close to the annular air guide channel 25 is the smallest, and the diameter of the end of the first rotating drum 21 away from the annular air guide channel 25 is the largest. The interior of the fixed guide drum 22 is provided with a conical avoidance groove 221 for installing the first rotating drum 21 and the first spiral blade 23. The inclination angle of the inner wall of the conical avoidance groove 221 is consistent with the inclination angle of the outer wall of the first rotating drum 21, and the outer wall of the first spiral blade 23 is in contact with the inclined surface of the inner wall of the conical avoidance groove 221.

[0054] Through the above-mentioned arrangement of the first rotating cylinder 21 and the fixed guide cylinder 22, the first exhaust cavity 24 can be made into an exhaust channel that gradually expands outward, that is, the air discharged from the first exhaust cavity 24 forms a spiral air curtain that gradually expands outward, thereby expanding the coverage of the air curtain, improving the isolation effect, and reducing the influence of the exhaust part of the first dust extraction mechanism 3 in the middle on the air curtain during exhaust, so that the air curtain can more completely isolate wind and dust, similar to the conical water curtain formed by spraying water during fire extinguishing.

[0055] like Figure 1-Figure 5 The exhaust pipe 31 shown is provided with a trumpet-shaped exhaust port 311 at one end close to the excavation direction, and the trumpet-shaped exhaust port 311 is fixedly connected to the end of the exhaust pipe 31 .

[0056] The trumpet-shaped air extraction port can expand the dust collection range at the front end of the air extraction pipe 31, so that the dust generated by mining can be captured more quickly by the air extraction pipe 31, thereby improving the dust extraction effect.

[0057] A plurality of first dust extraction holes 312 are annularly arranged on the outer wall of the exhaust pipe 31 around its own axis.

[0058] In order to improve the dust collection efficiency, in addition to the air extraction port at the front end of the exhaust duct 31, a number of first dust extraction holes 312 connected to the interior of the exhaust duct 31 are opened on the outer wall of the exhaust duct 31, so that the dust near the outer wall of the exhaust duct 31 can be sucked away, thereby improving the dust collection range and effect, and improving the coordination effect with the first air curtain generating mechanism 2.

[0059] like Figures 1-6 The figure also includes a telescopic drive mechanism 4, which is arranged at the end of the mounting frame 1 away from the excavation direction. The telescopic drive mechanism 4 is connected to the exhaust pipe 31 by transmission. The exhaust pipe 31 can be slidably connected along the axis of the first mounting cylinder 11, and several annular first dust extraction holes 312 are arranged in several rows in sequence along the length direction of the exhaust pipe 31.

[0060] The telescopic drive mechanism 4 can drive the exhaust pipe 31 connected to it to slide along the axis of the first mounting cylinder 11, that is, the distance between the end of the exhaust pipe 31 and the excavation area can be adjusted, thereby controlling the suction force and the dust collection effect. After the exhaust pipe 31 extends outward, the multiple rows of first dust collection holes 312 can efficiently absorb the dust on the surrounding side.

[0061] like Figures 1-8 The figure also includes a second air curtain generating mechanism 5 and a second dust extraction mechanism 6, both of which are installed on the outer wall of the second mounting cylinder 12; the second dust extraction mechanism 6 is located on the side of the second air curtain generating mechanism 5 close to the excavation direction; the second air curtain generating mechanism 5 includes a second rotating cylinder 51 installed on the second mounting cylinder 12 and capable of rotating around the axis of the second mounting cylinder 12, and a mounting plate 52 installed on the outer wall of the second mounting cylinder 12, the second rotating cylinder 51 is located between the mounting plate 52 and the annular air guide channel 25, a second exhaust cavity 53 is provided in the second rotating cylinder 51, the second exhaust cavity 53 includes a plurality of second spiral blades 54 distributed in a ring around the axis of the second rotating cylinder 51, a first exhaust hole 511 is provided on the outer wall of the second rotating cylinder 51 along the radial direction of the second mounting cylinder 12, a plurality of first exhaust holes 511 are provided, and the plurality of first exhaust holes 511 are distributed in a ring around the axis of the second rotating cylinder 51, and the first exhaust hole 511 is connected to the second exhaust cavity.

[0062] The second air curtain generating mechanism 5 can form an air curtain on the vertical plane between the coal mine excavation area and the operator's operating area, that is, the second air curtain, and can blow the dust leaked from the first air curtain to the second dust extraction mechanism 6 for further dust extraction, further improving the dust extraction isolation effect, preventing personnel from inhaling dust, improving the working environment, and improving the safety of coal mine excavation.

[0063] like Figure 7 The annular air guide channel 25 is communicated with both the first exhaust cavity and the second exhaust cavity.

[0064] When the second air curtain generating mechanism 5 is working, the annular air guide channel 25 introduces the high-pressure gas into the second exhaust cavity 53 formed inside the second rotating drum 51, and drives the second rotating drum 51 fixedly connected to the second spiral blade 54 to rotate on the second mounting drum 12 by pushing the second spiral blade 54 set in the second rotating drum 51, and exhausts radially outward through the first exhaust hole 511, and realizes the spiral exhaust function as the second rotating drum 51 rotates during the exhaust process, that is, a second air curtain for isolating the air is formed under the synchronous exhaust of several exhaust holes.

[0065] like Figure 7-Figure 8 The mounting plate 52 is provided with a second exhaust hole 521 arranged along its axial direction. There are a plurality of second exhaust holes 521 , and the plurality of exhaust holes are distributed in a ring around the axis of the second rotating drum 51 .

[0066] The second exhaust hole 521 can allow a portion of the high-pressure gas to be discharged outward along the forward direction of the second exhaust cavity 53, so that the high-pressure gas can circulate quickly in the second exhaust cavity 53, that is, it can drive the second rotating drum 51 to rotate during circulation.

[0067] It is worth mentioning that the dust between the two air curtains can be blown toward the second dust collection mechanism through the second exhaust hole 521, so that the second dust collection mechanism can collect the dust.

[0068] like Figure 7-Figure 8 The second dust extraction mechanism 6 shown includes an annular dust extraction chamber 61 and a dust extraction pipe 62. A plurality of second dust extraction holes 611 distributed in a ring around the axis of the second mounting tube 12 are provided on the outer wall of the dust extraction chamber. One end of the dust extraction pipe 62 is connected to the interior of the dust extraction chamber, and the other end of the dust extraction pipe 62 is connected to the air pump.

[0069] When the second dust extraction mechanism 6 is working, the annular dust extraction chamber 61 is connected to the air pump through the dust extraction pipe 62, and the external dust is extracted for the second time through the second dust extraction hole 611 on the outer wall of the annular dust extraction chamber 61, thereby improving the dust extraction efficiency and further improving the isolation effect of the air curtain.

[0070] An inwardly inclined surface 612 is provided on a side of the dust extraction chamber away from the second air curtain generating mechanism 5 , and the dust extraction holes are provided on the inclined surface 612 .

[0071] The inclined surface 612 can better increase the contact area for extracting dust, that is, dust from the front or side of the annular dust extraction chamber 61 can be quickly extracted by the annular dust extraction chamber 61 through the second dust extraction hole 611.

[0072] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An automatic air curtain generation device during coal mine excavation, characterized in that: It comprises a mounting frame (1), a first air curtain generating mechanism (2) and a first dust extraction mechanism (3); The mounting frame (1) comprises a first mounting tube (11) and a second mounting tube (12) which are coaxially arranged, and the second mounting tube (12) is located outside the first mounting tube (11); The first dust extraction mechanism (3) includes an air extraction pipe (31) coaxially arranged with the first mounting cylinder (11) and mounted in the first mounting cylinder (11), one end of the air extraction pipe (31) points to the coal mine excavation location, and the other end of the air extraction pipe (31) is connected to the air extraction pump; The first air curtain generating mechanism (2) includes a first rotating drum (21) and a fixed guide drum (22) arranged between a first mounting drum (11) and a second mounting drum (12); the first rotating drum (21) can be rotatably mounted on the outer wall of the first mounting drum (11); the first rotating drum (21) and the fixed guide drum (22) are coaxially arranged with the first mounting drum (11); a plurality of first spiral blades (23) are evenly distributed on the outer wall of the first rotating drum (21); the first spiral blades (23) are located in a first exhaust cavity (24) formed by a gap between the first rotating drum (21) and the fixed guide drum (22); and the first spiral blades (23) are fixedly connected to the first rotating drum (21); An annular air guide channel (25) is installed on the outer side wall of the first installation cylinder (11) away from the excavation side, one end of the annular air guide channel (25) is connected to the compressed air pump through the air guide pipe, and the other end of the annular air guide channel (25) is connected to the first exhaust cavity (24) and is transmission-connected to the first rotating cylinder (21) through the first spiral blade (23); It also includes a second air curtain generating mechanism (5) and a second dust extraction mechanism (6) installed on the outer side wall of the second installation cylinder (12); The second dust extraction mechanism (6) is located on a side of the second air curtain generating mechanism (5) close to the excavation direction; The second air curtain generating mechanism (5) includes a second rotating drum (51) installed on the second mounting drum (12) and capable of rotating around the axis of the second mounting drum (12), and a mounting plate (52) installed on the outer wall of the second mounting drum (12), the second rotating drum (51) is located between the mounting plate (52) and the annular air guide channel (25), a second exhaust cavity (53) is provided in the second rotating drum (51), the second exhaust cavity (53) includes a plurality of second spiral blades (54) annularly distributed around the axis of the second rotating drum (51), a first exhaust hole (511) radially arranged along the second mounting drum (12) is provided on the outer wall of the second rotating drum (51), a plurality of first exhaust holes (511) are provided, the plurality of first exhaust holes (511) are annularly distributed around the axis of the second rotating drum (51), and the first exhaust holes (511) are communicated with the second exhaust cavity; The second dust extraction mechanism (6) includes an annular dust extraction chamber (61) and a dust extraction pipe (62). A plurality of second dust extraction holes (611) are provided on the outer wall of the dust extraction chamber and are distributed in an annular manner around the axis of the second mounting cylinder (12). One end of the dust extraction pipe (62) is connected to the interior of the dust extraction chamber, and the other end of the dust extraction pipe (62) is connected to the air pump.

2. The automatic air curtain generation device during coal mine excavation according to claim 1 is characterized in that: The outer wall of the first rotating cylinder (21) is arranged to be inclined. The diameter of the end of the first rotating cylinder (21) close to the annular air guide channel (25) is the smallest, and the diameter of the end of the first rotating cylinder (21) away from the annular air guide channel (25) is the largest. A truncated cone-shaped avoidance groove (221) for installing the first rotating cylinder (21) and the first spiral blade (23) is provided inside the fixed guide cylinder (22). The inclination angle of the inner wall of the truncated cone-shaped avoidance groove (221) is consistent with the inclination angle of the outer wall of the first rotating cylinder (21). The outer wall of the first spiral blade (23) is in contact with the inclined surface of the inner wall of the truncated cone-shaped avoidance groove (221).

3. The automatic air curtain generation device during coal mine excavation according to claim 1 is characterized in that: A trumpet-shaped air extraction port (311) is provided at one end of the air extraction pipe (31) close to the excavation direction, and the trumpet-shaped air extraction port (311) is fixedly connected to the end of the air extraction pipe (31).

4. The automatic air curtain generation device during coal mine excavation according to claim 1 is characterized in that: A plurality of first dust extraction holes (312) are arranged in a ring shape around the axis of the air extraction pipe (31) on the outer side wall.

5. The automatic air curtain generation device during coal mine excavation according to claim 4 is characterized in that: The invention also includes a telescopic drive mechanism (4), which is arranged at one end of the mounting frame (1) away from the excavation direction. The telescopic drive mechanism (4) is in transmission connection with an air extraction pipe (31), and the air extraction pipe (31) is slidably connected along the axis of the first mounting cylinder (11). A plurality of annularly arranged first dust extraction holes (312) are sequentially arranged in a plurality of rows along the length direction of the air extraction pipe (31).

6. The automatic air curtain generation device during coal mine excavation according to claim 1 is characterized in that: The annular air guide channel (25) is in communication with both the first exhaust cavity and the second exhaust cavity.

7. The automatic air curtain generation device during coal mine excavation according to claim 1 is characterized in that: The mounting plate (52) is provided with a second exhaust hole (521) arranged along its axial direction. There are a plurality of second exhaust holes (521), and the plurality of exhaust holes are distributed in a ring shape around the axis of the second rotating drum (51).

8. The automatic air curtain generating device during coal mine excavation according to claim 1, characterized in that: An inwardly inclined inclined surface (612) is provided on a side of the dust extraction chamber away from the second air curtain generating mechanism (5), and the dust extraction hole is arranged on the inclined surface (612).

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