Coal mine cutting dust strong mist flow - double negative pressure control dust removal device

Abstract

The present invention discloses a strong mist flow-double negative pressure control dust removal device for coal mine cutting dust, comprising an exhaust duct arranged on a tunnel boring machine, and a negative pressure dust extraction sleeve which is externally mounted on the cutting arm of the tunnel boring machine in the form of an annular duct, wherein a negative pressure conduit drawn out from the exhaust duct is connected to the negative pressure dust extraction sleeve. The tunnel boring machine exhaust duct in the present invention is connected to the exhaust fan to form a "working face negative pressure field", while a negative pressure conduit drawn out from the exhaust duct is connected to the negative pressure dust extraction sleeve externally mounted on the cutting arm, forming a "dust source negative pressure field" which is closer to the dust source, and the "dust source negative pressure field" and the "working face negative pressure field" cooperate to form a "double negative pressure" effect. Under the action of the "dust source negative pressure field", the spray field of the external spray device shows an inward contraction state, the spray droplets are denser, and the resistance to wind disturbance is better, forming a "strong mist flow" effect, and improving the dust reduction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of dust prevention and control in a fully mechanized excavation working surface, and in particular to a strong mist flow-double negative pressure controlled dust removal device for cutting dust in a coal mine. Background Art

[0002] With the rapid development of my country's economy, coal mining technology has also been continuously improving and developing, rapidly moving towards mechanization, automation, and intelligentization. As the level of mechanization in coal mining continues to rise, the amount of dust generated during the mining process will also continue to increase. Due to the variable dust-generating locations and complex technical processes, fully mechanized excavation working faces have become one of the main sources of dust in underground coal mines. The dust generated during tunneling is spread throughout the entire working area by compressed air, posing a significant threat to the health and safety of coal miners.

[0003] At present, ventilation dust removal and spray dust reduction technologies are widely used in coal mines. Among them, external spray dust reduction technology is more widely used due to its wide range of applications, strong operability, low cost and other advantages, especially in comprehensive excavation working faces. About 80% of comprehensive excavators are equipped with external spray. At the same time, external spray dust reduction technology is often combined with ventilation negative pressure control dust removal technology to carry out joint efficiency-enhancing dust removal. However, the fog field formed by the currently used spray dust reduction technology is relatively scattered, resulting in it being greatly affected by the wind disturbance on the compressed wind side, which makes the fog field less able to wrap around the cutting head and dust easily escapes. At the same time, in the existing negative pressure control dust removal technology, the negative pressure port is far away from the dust source of the cutting head, and the dust suction range is small, resulting in low dust control efficiency, and it is difficult to achieve the ideal dust control effect.

[0004] Therefore, it is particularly important to study a dust control device with better fog field wrapping and higher negative pressure dust collection efficiency, which can reduce cutting dust pollution and effectively protect the health of underground personnel. Summary of the Invention

[0005] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a coal mine cutting dust strong mist flow-double negative pressure control dust removal device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a coal mine cutting dust strong mist flow - double negative pressure control dust removal device, comprising an exhaust pipe installed on a fully-mechanized tunneling machine, and also comprising a negative pressure dust extraction sleeve in the form of an annular air pipe externally mounted on the cutting arm of the fully-mechanized tunneling machine, a negative pressure conduit leading out of the exhaust pipe and connected to the negative pressure dust extraction sleeve;

[0007] It also includes a spray device fixed in a ring shape on the outer ring of the negative pressure dust extraction sleeve. The spray device is provided with several fan-shaped nozzles arranged in a ring shape. The nozzle outlet guide bodies of all the fan-shaped nozzles are directed toward the inside of the spray device, so that the inner fog field formed by the fan-shaped nozzles is directed toward the center of the cutting head to wrap around it.

[0008] Preferably, a guide fan is also provided at the end of the negative pressure conduit.

[0009] Preferably, the spray device is connected to the water supply system through an external water pipe, and a solenoid valve device and a booster pump are installed on the external water pipe.

[0010] Preferably, a deflector is installed at the front end of the negative pressure dust extraction sleeve to remove mist from the airflow.

[0011] Preferably, a stacking groove bottom plate is provided at the lower end of the negative pressure dust extraction sleeve, and the stacking groove bottom plate cooperates with the inner wall of the negative pressure dust extraction sleeve to form a stacking groove. The angle between the stacking groove and the negative pressure dust extraction sleeve is α, and α is between 45° and 60°.

[0012] Preferably, a gravity balance plate is provided at one end of the stacking trough bottom plate away from the deflector plate, and the gravity balance plate and the stacking trough bottom plate are connected via a rotating shaft.

[0013] Preferably, an exhaust volume controller is installed at the head of the exhaust cylinder, and the exhaust volume controller controls the exhaust volume by adjusting the exhaust area of ​​the exhaust cylinder.

[0014] Preferably, the exhaust volume controller includes an exhaust cylinder outer cylinder fixed to the exhaust cylinder head, an inner cylinder is rotatably installed in the exhaust cylinder outer cylinder, a plurality of fixed valve plates are distributed at intervals on the inner side of the exhaust cylinder outer cylinder, and a plurality of movable valve plates are fixed at intervals on the inner side of the inner cylinder, a control handle is also connected to the circumferential surface of the inner cylinder, the control handle extends through the exhaust cylinder to the outside thereof, and the inner cylinder is driven to rotate by rotating the control handle to change the angle between the movable valve plate and the fixed valve plate.

[0015] Preferably, a dust concentration sensor and a controller are also included, the output end of the dust concentration sensor is connected to the controller input end signal, and the output end of the controller is respectively connected to the booster pump, the solenoid valve device, the guide fan and the exhaust volume controller signal.

[0016] Compared with the existing technology, the present invention provides a coal mine cutting dust strong mist flow - double negative pressure control dust removal device, which has the following beneficial effects:

[0017] The device proposed in the present invention can form a "strong mist flow" effect, and the mist flow density is increased by 1-2 times. Under the action of negative pressure, the spray field appears to be in an inward contraction state, the spray droplets are denser, and have better resistance to wind disturbances and are not easily blown away by wind. More droplets are sprayed on the cutting head, better wrapping the dust source of the cutting head, increasing the collision efficiency of the spray droplets and dust particles, and reducing the escape of dust.

[0018] At the same time, a negative pressure duct is drawn out from the exhaust duct, and combined with the built-in guide fan, a "dust source negative pressure field" is formed closer to the dust source, which more effectively absorbs the dust generated by the cutting head, and cooperates with the "working face negative pressure field" formed by the exhaust duct to produce a "double negative pressure" effect. The negative pressure air volume of the "working face negative pressure field" is 300-600 m 3 / min, and the negative pressure air volume of the “dust source negative pressure field” is 60-100 m 3 / min; at the same time, since the "strong mist flow" has better wrapping effect on the dust source of the cutting head, the dust that is not completely captured by the collision of the mist droplets will be sucked into the negative pressure dust extraction sleeve under the action of the "dust source negative pressure field", thereby improving the dust reduction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of a coal mine cutting dust strong mist flow-double negative pressure control dust removal device of the present invention;

[0021] Figure 2 This is a front view of a coal mine cutting dust strong mist flow-double negative pressure control dust removal device of the present invention;

[0022] Figure 3 Schematic diagram of the fan-shaped nozzle used in the present invention;

[0023] Figure 4 A comparison diagram of the fog field shapes when the prior art and the device of the present invention are implemented;

[0024] Figure 5 Schematic diagram of the exhaust volume controller in the present invention;

[0025] Figure 6 Schematic cross-section of the negative pressure dust extraction sleeve of the present invention;

[0026] Figure 7 A partial schematic diagram of the accumulation groove in the negative pressure dust extraction sleeve of the present invention;

[0027] Figure 8 Schematic diagram of comparison of dust concentration in tunnels using the present invention.

[0028] Among them, 1. comprehensive excavator; 2. negative pressure dust extraction sleeve; 201. deflector; 202. cutting arm; 203. gravity balance plate; 204. accumulation trough bottom plate; 205. rotating shaft; 3. external spray device; 301. fan nozzle; 302. fan nozzle outlet guide body; 4. solenoid valve device; 5. controller; 6. booster pump; 7. water pipe; 8. negative pressure duct; 9. exhaust volume controller; 901. control handle; 902. exhaust cylinder outer cylinder; 903. embedded cylinder; 904. fixed valve plate; 905. moving valve plate; 10. guide fan; 11. bracket; 12. exhaust cylinder; 13. pressure cylinder; 14. cutting head; 15. dust concentration sensor; 16. accumulation trough. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0030] This embodiment proposes a coal mine cutting dust strong mist flow - double negative pressure control dust removal device, such as Figure 1 As shown, the negative pressure dust extraction sleeve 2 contained therein is externally mounted on the cutting arm 202 of the tunnel boring machine 1 in the form of an annular air duct, and the exhaust duct 12 is mounted on the body of the tunnel boring machine 1 through a bracket 11. The exhaust duct 12 is connected to the exhaust fan to form a "working face negative pressure field", and a negative pressure duct 8 is drawn out from the exhaust duct 12 and connected to the negative pressure dust extraction sleeve 2. Combined with the function of the exhaust fan externally connected to the exhaust duct 12, a "dust source negative pressure field" closer to the dust source is formed; a guide fan 10 is provided at the end of the negative pressure duct 8, and the guide fan 10 is connected to the controller 5. The dust concentration sensor 15 transmits the dust concentration data to the controller 5 through the underground Wifi or 5G signal. The controller 5 adjusts the air volume of the guide fan 10 according to the received data, and can achieve an independent adjustment effect of the negative pressure air volume of the "dust source negative pressure field" according to the actual dust concentration of the working face.

[0031] The external spray device 3 is fixed in a ring shape on the outer ring of the negative pressure dust extraction sleeve 2. Ten fan-shaped nozzles 301 are installed on the external spray device 3, and water is supplied to the external spray device 3 through an external water pipe 7. A solenoid valve device 4 and a booster pump 6 are installed on the water supply pipeline, and the solenoid valve device 4 and the booster pump 6 are both connected to the controller 5. A dust concentration sensor 15 is suspended near the head to detect and transmit the concentration data of dust generated by the cutting of the comprehensive tunneling machine. When the controller 5 receives the dust concentration data, it adjusts the spray pressure by controlling the booster pump 6, and at the same time adjusts the spray flow by controlling the solenoid valve device 4, so as to achieve the effect of real-time control of the spray field according to the change of dust concentration, thereby avoiding excessive waste of water resources and realizing efficient dust control.

[0032] like Figure 2 and Figure 3 As shown, ten fan-shaped nozzles 301 are arranged in a ring on the outer spray device 3. The shape of the nozzle outlet guide body 302 causes the nozzles 301 to emit a fan-shaped mist field, making the mist flow more concentrated. Based on the shape characteristics of the nozzle outlet guide body 302, the fan-shaped nozzles 301 are arranged circumferentially so that the mist field formed by the fan-shaped nozzles 301 is directed toward the center of the cutting head 14. This arrangement of the fan-shaped nozzles 301 makes the spray droplets denser, more resistant to wind disturbances, and less likely to be blown away by wind. More droplets are sprayed on the cutting head 14, better enveloping the dust source of the cutting head 14, increasing the collision efficiency between the spray droplets and dust particles, reducing dust escape, and also reducing water resource loss, resulting in greater energy efficiency and efficiency.

[0033] Figure 4The figure shows a comparison of the fog field shapes when the prior art and the device of the present invention are implemented. The left figure is a schematic diagram of the fog field shape formed by using an ordinary nozzle. The fog field generated by the external spray device 3 is offset toward the exhaust duct 12 side under the disturbance of the wind flow at the comprehensive excavation working face, so that the wrapping effect of the fog field on the cutting head 14 becomes worse, and part of the cutting head 14 cannot be effectively wrapped by the fog field; the arrows shown in the figure represent the migration trajectory of part of the dust generated by the cutting operation of the cutting head 14. After the cutting operation of the cutting head 14 generates dust, the dust generated by the part of the cutting head 14 that is not wrapped will escape everywhere, and the other part of the dust that cannot be settled by the fog field will move toward the exhaust duct 12 side along with the wind flow at the working face. After adopting the device of the present invention, the fog field formed by the fan-shaped nozzle 301 in the external spray device 3 is all oriented toward the center of the cutting head, making the fog field more effectively enveloping the cutting head. Furthermore, through the "dust source negative pressure field," the spray field presents an inward-contracting fog field shape as shown in the right figure. The spray droplets are denser, more resistant to wind disturbances, and less likely to be blown away by wind. This allows more droplets to be sprayed onto the cutting head 14, better enveloping the cutting head's dust source, increasing the collision efficiency between the spray droplets and dust particles and reducing dust escape. The fan-shaped nozzle and the "dust source negative pressure field" work together to form a "strong fog flow" effect. The "dust source negative pressure field" and the "working surface negative pressure field" work together to form a "double negative pressure" effect. Because the "strong fog flow" better envelops the cutting head 14's dust source, it prevents dust from escaping. Dust not completely captured by the droplet collisions will be drawn into the negative pressure dust extraction sleeve 2 under the action of the "dust source negative pressure field," improving dust reduction efficiency.

[0034] Exhaust volume controller 9 Figure 5 As shown, it is installed at the head of the exhaust cylinder 12, and the exhaust volume is controlled by adjusting the exhaust area of ​​the exhaust cylinder 12. Specifically, it includes an exhaust cylinder outer cylinder 902 fixed on the head of the exhaust cylinder 12, an inner cylinder 903 is rotatably installed in the exhaust cylinder outer cylinder 902, and several fixed valve plates 904 are distributed at intervals on the inner side of the exhaust cylinder outer cylinder 902, and several movable valve plates 905 are fixed at intervals on the inner side of the inner cylinder 903. A control handle 901 is also connected to the circumferential surface of the inner cylinder 903, and the control handle 901 extends through the exhaust cylinder 12 to the outside thereof. The inner cylinder 903 is driven to rotate by rotating the control handle 901 to change the angle between the movable valve plate 905 and the fixed valve plate 904. The inner cylinder 903 is rotated by rotating the control handle 901, and the movable valve plate 905 is driven to rotate together, thereby changing the exhaust area. When the movable valve plate 905 rotates to a state of overlapping with the fixed valve plate 904, the exhaust area is maximized. It should be further pointed out that since the cylinder wall is not made of smooth material, there is friction between the outer cylinder 902 of the exhaust cylinder and the inner cylinder 903. Under the action of friction resistance, the inner cylinder 903 is fixed on the inside of the exhaust cylinder to prevent the inner cylinder 903 from rotating naturally without being controlled by the control handle 901.

[0035] like Figure 6As shown, the negative pressure dust extraction sleeve 2 in the present invention is externally mounted on the cutting arm 202 of the tunnel boring machine 1 in the form of an annular air duct, and a deflector 201 is installed at the front end of the negative pressure dust extraction sleeve 2 to remove the mist sucked into the airflow, and an accumulation groove 16 is provided at the lower end of the negative pressure dust extraction sleeve 2 to accumulate large particles and droplets such as dust, dust-mist mixture, etc. sucked in by the negative pressure.

[0036] The stacking tank 16 is further as Figure 7 As shown, a stacking groove bottom plate 204 is provided at the lower end of the negative pressure dust extraction sleeve 2. The stacking groove bottom plate 204 cooperates with the inner wall of the negative pressure dust extraction sleeve 2 to form a stacking groove 16. The angle between the stacking groove 16 and the negative pressure dust extraction sleeve 2 is α. The angle α is set to be greater than the natural accumulation angle of dust, generally between 45° and 60°, which effectively avoids the overflow of deposits into the negative pressure dust extraction sleeve 2 due to the angle α being smaller than the accumulation angle. When large particles such as dust, dust mist mixture and droplets are sucked into the negative pressure dust extraction sleeve 2, they will naturally accumulate in the accumulation trough 16. The accumulation trough bottom plate 204 is openable and closable. A gravity balance plate 203 is provided at the end of the accumulation trough bottom plate 204 away from the deflector 201. The gravity balance plate 203 and the accumulation trough bottom plate 204 are connected by a rotating shaft 205; when there is less deposit in the accumulation trough 16 and the weight is lighter than the gravity balance plate 203, the accumulation trough bottom plate 204 will be in a closed state under the action of the gravity of the gravity balance plate 203; when the deposit in the accumulation trough 16 reaches a certain mass and the weight is greater than the gravity balance plate 203, the accumulation trough bottom plate 204 will rotate under the action of the rotating shaft 205, causing the accumulation trough bottom plate 204 to open. When the weight of the deposit in the accumulation trough 16 is greater than the gravity balance plate 203, the accumulation trough bottom plate 204 automatically opens to clean the deposit under the action of the rotating shaft 205; when the deposit is cleaned up, the accumulation trough bottom plate 204 closes again under the action of the gravity balance plate 203, and continues to collect large particles and droplets sucked into the negative pressure dust extraction sleeve 2; this structure can automatically clean the negative pressure dust extraction sleeve 2 without manual work, avoiding the problem of blockage of the negative pressure dust extraction sleeve 2 due to untimely manual cleaning, resulting in increased wind resistance, and saving human resources at the same time.

[0037] In addition, if Figure 8 As shown in the figure, the present invention also uses the numerical simulation software Fluent to calculate the distribution diagram of the dust concentration in the tunnel under different negative pressure air volumes of the device. According to the simulation results, it can be found that as the negative pressure air volume increases, the dust concentration on the upper part of the working surface continues to decrease, and the dust concentration at the worker's working height decreases. When the negative pressure dust extraction sleeve 2 is not used, the dust concentration at the worker's working height is greater than 50mg / m 3 , when the negative pressure air volume is 60m 3 / min, the dust concentration at the worker's working height is less than 10mg / m 3 The dust removal efficiency is increased to more than 80%, which further verifies that the dust control effect of the device of the present invention is significant.

[0038] The present invention proposes a coal mine cutting dust strong mist flow - double negative pressure control dust removal device, the specific working process of which is as follows:

[0039] (1) The tunnel boring machine 1 starts working, and the cutting head 14 generates dust during cutting. The dust concentration sensor 15 detects the generated dust concentration and transmits the dust concentration data to the controller 5 via the underground Wi-Fi or 5G signal;

[0040] (2) The controller 5 controls the electromagnetic valve device 4 to adjust the flow rate of the water pipe 7 according to the obtained dust concentration data, thereby adjusting the spray flow rate. At the same time, the controller 5 controls the booster pump 6 to adjust the spray pressure. By controlling the spray pressure and flow rate, the dust removal is carried out accurately and efficiently.

[0041] (3) While the external spray device 3 is spraying and controlling the dust removal operation, the negative pressure dust extraction sleeve 2 is also turned on; the controller 5 adjusts the exhaust air volume of the guide fan 10 in real time according to the dust concentration data transmitted by the dust concentration sensor 15, thereby changing the negative pressure air volume of the "dust source negative pressure field" so that different negative pressure exhaust volumes are used under different dust concentrations to avoid energy waste;

[0042] (4) Turn the control knob 901 in the exhaust volume controller 9 at the front of the exhaust tube 12 to drive the embedded tube 903 and the movable valve plate 905 to rotate together, thereby changing the exhaust area of ​​the exhaust tube 12 and further changing the negative pressure air volume of the "negative pressure field of the working surface";

[0043] (5) When the weight of the deposits in the accumulation groove 16 of the negative pressure dust extraction sleeve 2 is greater than the gravity balance plate 203, the accumulation groove bottom plate 204 rotates under the action of the rotating shaft 205, so that the accumulation groove bottom plate 204 opens and automatically cleans the deposits; when the deposits are cleaned up, under the action of the gravity balance plate 203, the accumulation groove bottom plate 204 closes again and continues to collect large particles and droplets sucked into the negative pressure dust extraction sleeve.

[0044] The coal mine cutting dust strong mist flow - double negative pressure control dust removal device proposed in this invention is applied to the fully mechanized excavation working face of a coal mine to reduce dust. The specific experimental results are compared with the traditional dust reduction method. The following table shows:

[0045] Comparison table of dust fall data before and after using the present invention

[0046]

[0047] In the description of the present invention, the terms "first," "second," "another," and "yet another" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0048] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A coal mine cutting dust strong mist flow-double negative pressure control dust removal device, comprising an exhaust pipe (12) arranged on a fully mechanized excavator (1), characterized in that: It also includes a negative pressure dust extraction sleeve (2) which is mounted on the cutting arm (202) of the excavator (1) in the form of an annular air cylinder, and a negative pressure conduit (8) is led out of the air cylinder (12) and connected to the negative pressure dust extraction sleeve (2); It also includes an outer spray device (3) fixed in an annular shape to the outer ring of the negative pressure dust extraction sleeve (2), with a plurality of fan-shaped nozzles (301) arranged in an annular shape on the outer spray device (3), and the nozzle outlet guide bodies (302) of all the fan-shaped nozzles (301) are directed toward the inner side of the outer spray device (3), so that the fog field formed by the fan-shaped nozzles (301) is directed toward the center of the cutting head (14) to form a wrap around it; A guide fan (10) is also provided at the end of the negative pressure conduit (8); The external spray device (3) is connected to the water supply system via an external water pipe (7), and a solenoid valve device (4) and a booster pump (6) are installed on the external water pipe (7); A baffle (201) is installed at the front end of the negative pressure dust extraction sleeve (2) to remove mist in the air flow; The lower end of the negative pressure dust extraction sleeve (2) is provided with an accumulation groove bottom plate (204), and the accumulation groove bottom plate (204) cooperates with the inner wall of the negative pressure dust extraction sleeve (2) to form an accumulation groove (16). The angle between the accumulation groove (16) and the negative pressure dust extraction sleeve (2) is α, and α is between 45° and 60°.

2. The coal mine cutting dust strong mist flow-double negative pressure control dust removal device according to claim 1 is characterized by: A gravity balance plate (203) is provided at one end of the stacking trough bottom plate (204) facing away from the deflector plate (201), and the gravity balance plate (203) and the stacking trough bottom plate (204) are connected via a rotating shaft (205).

3. The coal mine cutting dust strong mist flow-double negative pressure control dust removal device according to claim 1 is characterized by: An exhaust volume controller (9) is installed at the head of the exhaust cylinder (12), and the exhaust volume controller (9) controls the exhaust volume by adjusting the exhaust area of ​​the exhaust cylinder (12).

4. The coal mine cutting dust strong mist flow and double negative pressure control dust removal device according to claim 3 is characterized by: The exhaust volume controller (9) includes an exhaust cylinder outer cylinder (902) fixed to the head of the exhaust cylinder (12), an inner cylinder (903) is installed in the exhaust cylinder outer cylinder (902), a plurality of fixed valve plates (904) are distributed at intervals on the inner side of the exhaust cylinder outer cylinder (902), and a plurality of movable valve plates (905) are fixed at intervals on the inner side of the inner cylinder (903), and a control knob (901) is connected to the circumferential surface of the inner cylinder (903), and the control knob (901) extends through the exhaust cylinder (12) to the outside thereof, and the inner cylinder (903) is driven to rotate by rotating the control knob (901) to change the angle between the movable valve plate (905) and the fixed valve plate (904).

5. The coal mine cutting dust strong mist flow and double negative pressure control dust removal device according to claim 4 is characterized by: The system further comprises a dust concentration sensor (15) and a controller (5), wherein the output end of the dust concentration sensor (15) is signal-connected to the input end of the controller (5), and the output end of the controller (5) is signal-connected to the booster pump (6), the solenoid valve device (4), the guide fan (10), and the exhaust volume controller (9).

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