Machine-mounted spraying and dust settling device of fully mechanized coal mining face heading machine and using method thereof

Abstract

The invention discloses a fully mechanized coal mining face heading machine onboard spraying and dust reducing device and a using method thereof, the spraying and dust reducing device comprises a fixing assembly, a folding support, a transmission assembly and a water outlet assembly, the fixing assembly is connected with the folding support through the transmission assembly, and the water outlet assembly is arranged between the folding support and the fixing assembly. The using method comprises the following steps that S1, all the assemblies are assembled; s2, the fixing assembly is fixedly arranged on the outer side of a mechanical arm of the heading machine in a sleeving mode; s3, injecting water flow into the water injection pipe through a water source pipeline, and spraying the water flow out of a water spray nozzle through a water inlet pipe; s4, a folding support is controlled to act, and the water spraying range of a water spraying nozzle is adjusted; s5, a servo motor is started, a water inlet pipe and a water spray nozzle rotate around a mechanical arm of the heading machine together, and water flow sprayed out of the water spray nozzle is in a rotating water mist state; and S6, tunneling operation is carried out, dust generated in the tunneling process can be covered with rotating water mist, and the tunneling dust falling effect is achieved.

Description

Technical Field

[0001] The invention relates to the field of coal mining, and in particular to an onboard spray dust suppression device of a fully mechanized mining face tunneling machine and a use method thereof. Background Art

[0002] In coal mining operations, the generation of large amounts of dust has become a problem that cannot be ignored. If not properly handled, workers who are in such an environment for a long time are very likely to suffer from serious occupational diseases such as pneumoconiosis. In addition, dust may also cause other health problems such as eye irritation and skin allergies. At the same time, high concentrations of dust have the risk of causing explosions under certain conditions, posing a serious threat to coal mine production safety. A good working environment not only helps improve workers' work efficiency and concentration, but also reduces safety accidents caused by reasons such as obstructed vision.

[0003] Existing dust removal equipment usually performs adsorption treatment on the entire space after the dust is diffused. It is unable to perform dust removal and dust reduction operations specifically for the mining area, and is unable to clean the dust from the source, causing some dust to still be suspended in the air. Its cleaning effect does not meet the ideal dust removal standard, and it is necessary to improve it. Summary of the invention

[0004] The object of the present invention is to provide an onboard spray dust reduction device for a fully mechanized mining face tunneling machine with a simple structure and easy use, and a method for using the device, in order to solve the above-mentioned problems.

[0005] In order to achieve the above object, the technical solution of the present invention is: A spray dust suppression device mounted on a tunnel boring machine for a comprehensive mining working face comprises a fixed assembly, a folding bracket, a transmission assembly and a water outlet assembly. The fixed assembly is connected to the folding bracket via the transmission assembly, and the water outlet assembly is arranged between the folding bracket and the fixed assembly; the fixed assembly comprises a first fixing part and a second fixing part, the first fixing part and the second fixing part are coaxially arranged and both are fixedly sleeved on the outside of the mechanical arm of the tunnel boring machine, the outer periphery of the first fixing part is rotatably connected to one end of the water outlet assembly, the other end of the water outlet assembly is connected to the transmission assembly via the folding bracket, and the transmission assembly is rotatably connected to the second fixing part.

[0006] Furthermore, the first fixing member is in the shape of an annular column, the inner wall of the first fixing member is fixedly connected to the mechanical arm of the tunnel boring machine, a receiving groove is arranged around the outer periphery of the first fixing member, and a water injection pipe is fixedly connected to the end face of one axial end of the first fixing member, and one end of the water injection pipe is connected to the receiving groove.

[0007] Furthermore, the water outlet assembly includes a first circular ring member and a water inlet pipe. The inner circumferential side wall of the first circular ring member is rotatably connected to the outer circumferential side wall of the first fixed member through a first sealing bearing and encloses the receiving groove to form an annular sealing cavity. A plurality of water flow holes are arranged on the outer circumferential side wall of the first circular ring member at equal intervals along the circumferential direction of the first circular ring member; a plurality of water inlet pipes are arranged, and the plurality of water inlet pipes are arranged corresponding to the plurality of water flow holes. One end of the water inlet pipe is fixedly connected to the outer side wall of the first circular ring member and is connected to the receiving groove through the corresponding water flow hole, and the other end of the water inlet pipe is connected to the folding bracket and the end is connected to a water nozzle.

[0008] Furthermore, the transmission assembly includes a servo motor and a second circular ring member, and the second circular ring member is rotatably connected to one axial end of the second fixed member through a second sealed bearing; the servo motor is fixedly connected to the outer wall of the second fixed member, and the output shaft of the servo motor is connected to the transmission gear, and the transmission gear is meshingly connected to the transmission gear ring fixedly sleeved on the outside of the second circular ring member; the outer periphery of the second circular ring member is connected to the folding bracket.

[0009] Furthermore, there are several folding brackets, and the several folding brackets are arranged at equal intervals along the circumferential direction of the second circular ring member and the several folding brackets correspond to several water inlet pipes; the folding bracket includes an explosion-proof motor, an upper frame, and a lower frame, one end of the lower frame is fixedly connected to the second circular ring member, and the other end of the lower frame is fixedly connected to the explosion-proof motor; one end of the upper frame is provided with a snap groove and is snap-connected to the outer wall of the water inlet pipe through the snap groove, and the other end of the upper frame is transmission connected to the explosion-proof motor.

[0010] Furthermore, the length direction of the upper frame and the lower frame is consistent with the radial direction of the second circular ring part, and a first clip is fixedly sleeved on the outer side of the output shaft of the explosion-proof motor, and the axial direction of the first clip is perpendicular to the length direction of the upper frame and the lower frame; one end of the upper frame is fixedly connected with a second clip, and the second clip is sleeved on the outside of the first clip and the second clip is engaged and connected with the first clip; when the explosion-proof motor drives the output shaft to rotate, the upper frame and the second clip and the first clip rotate and fold around the axis of the first clip.

[0011] Furthermore, there are two explosion-proof motors and both are symmetrically arranged at one end of the lower frame. The two explosion-proof motors share one output shaft and the two explosion-proof motors simultaneously perform rotational driving operations on the shared output shaft.

[0012] Furthermore, the water inlet pipe is an L-shaped plastic pipe, one end of which is fixedly connected to the outer side wall of the first arc, and the other end of which is bent and snap-connected to one end of the upper frame.

[0013] Furthermore, two water injection pipes are provided and the two water injection pipes are symmetrically arranged on both sides of the end surface of the first fixing member, and one end of the water injection pipe away from the containing tank is connected to the water source pipeline or the air source pipeline.

[0014] A method for using an onboard spray dust suppression device of a fully mechanized mining face tunneling machine comprises the following steps: S1. Complete the assembly and installation of the fixed component, folding bracket, transmission component, and water outlet component; S2, fixing the first fixing member and the second fixing member in the fixing assembly on the outside of the mechanical arm of the tunnel boring machine; S3, injecting water into the water injection pipe through the water source pipeline, the water flows into a plurality of water inlet pipes after passing through the receiving tank, and is sprayed out from the water spray nozzles at the ends of the water inlet pipes; S4, controlling the explosion-proof motor in the folding bracket to rotate, so that the upper frame drives the water inlet pipe and the water nozzle to extend or fold, and adjusting the water spraying range of the water nozzle to achieve a suitable state; S5, starting the servo motor, the second circular ring member, the folding bracket, the water inlet pipe, and the first circular ring member rotate together around the mechanical arm of the tunnel boring machine, so that the water flow sprayed from the water spray nozzle forms a rotating water mist state; S6. Control the tunnel boring machine to carry out excavation operations on the working face. The rotating water mist will cover the dust generated during the excavation process to achieve the excavation dust reduction effect.

[0015] Compared with the prior art, the present invention has the following advantages and positive effects: The present invention is fixedly installed on the outside of the mechanical arm of the tunnel boring machine through a fixed component, and can perform spray dust reduction operations on the dust generated at the tunneling point during the tunneling process through the water outlet component, thereby realizing the dust cleaning work from the source, avoiding the dust from spreading from the tunneling point to the overall space and affecting the construction environment, so that the dust cleaning effect in the coal mining area can reach the ideal dust removal standard; and, by arranging a folding bracket structure on the outside of the fixed component, the present invention can adjust the water spray range of the water outlet component, so that it can form different water spray ranges for different tunneling points; at the same time, combined with the transmission component, the water outlet component can be rotated, and finally the water sprayed from the water nozzle in the water outlet component forms a rotating water mist state, which can adapt to different angles and positions, ensuring that every corner can be properly treated with dust reduction, and when facing some tunneling spaces with irregular shapes, the dust reduction effect can be effectively improved, which brings convenience to the dust removal and dust reduction operations in the coal mine tunneling construction area. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 The structure of the present invention is schematically shown Figure 1 ; Figure 2 The structure of the present invention is schematically shown Figure 2 ; Figure 3 is a schematic diagram of the structure of the transmission component; Figure 4 is a cross-sectional structural diagram of a first fixing member; Figure 5 A schematic diagram of the structure of a folding bracket. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0019] like Figures 1 to 5 As shown, this embodiment discloses an onboard spray dust suppression device for a fully mechanized mining face tunneling machine, comprising a fixed component, a folding bracket 8, a transmission component, and a water outlet component. The fixed component is connected to the folding bracket through the transmission component, and the water outlet component is arranged between the folding bracket 8 and the fixed component. The fixing assembly includes a first fixing part 1 and a second fixing part 2, both of which are made of explosion-proof plastic, which can reduce the overall weight of the equipment, prevent the equipment from being too heavy and affecting the overall balance of the tunnel boring machine, and reduce the equipment cost; the first fixing part 1 and the second fixing part 2 are both in the shape of an annular cylinder, the second fixing part 1 is coaxially arranged with the first fixing part 2 and both are fixedly sleeved on the outside of the mechanical arm of the tunnel boring machine, the outer periphery of the first fixing part 1 is rotatably connected to one end of the water outlet assembly, and the other end of the water outlet assembly is connected to the transmission assembly through a folding bracket 8, and the transmission assembly is rotatably connected to the second fixing part 2.

[0020] A receiving groove 101 is arranged around the outer periphery of the first fixing member 1, and two water injection pipes 6 are fixedly connected or integrally formed on the end face of one axial end of the first fixing member 1, one end of the water injection pipe 6 is connected to the receiving groove 101, and the other end of the water injection pipe 6 can be connected to two water source pipelines, or one water injection pipe can be connected to one water source pipeline and the other water injection pipe can be connected to an air source pipeline, so as to increase the flow rate of the water flow through high-pressure gas, so as to achieve better spraying and atomization effects of the water flow.

[0021] The water outlet assembly includes a first circular ring member 3 and a water inlet pipe 4. The first circular ring member 3 is sleeved on the outer circumference of the first fixing member 1. The inner circumferential side wall of the first circular ring member 3 is rotatably connected to the outer circumferential side wall of the first fixing member 1 through a first sealing bearing 11 and surrounds the accommodating groove 101 to form an annular sealing cavity. Six water flow holes 301 are arranged on the outer circumferential side wall of the first circular ring member 3 at equal intervals along the circumferential direction of the first circular ring member 3; six water inlet pipes 4 are arranged, and the six water inlet pipes 4 are arranged corresponding to the six water flow holes 301. The water inlet pipe 4 is an L-shaped plastic pipe. One end of the water inlet pipe 4 is fixedly connected to the outer wall of the first circular ring member 3 and is connected to the receiving groove 101 through the corresponding water flow hole 301. The other end of the water inlet pipe 4 is bent and engaged with the folding bracket 8. The plastic pipe can be bent to an appropriate amount. When the folding bracket 8 is folded, the water inlet pipe 4 will bend and deform appropriately with the folding bracket 8. The end of the water inlet pipe 4 is connected to a water nozzle 5, which ultimately changes the range of water sprayed by the water nozzle 5.

[0022] The water nozzle can perform two tasks at the same time, namely high-pressure water jet and high-pressure water spray. The high-pressure water jet can assist the high-pressure water spray in dust reduction. There are 6 water nozzles designed in total, which effectively improves the spray range and dust reduction effect.

[0023] The transmission assembly includes a servo motor 9 and a second circular ring member 7. The second circular ring member 7 is coaxially arranged with the second fixed member 2. The second circular ring member 2 is rotatably connected to one axial end of the second fixed member 2 through a second sealed bearing 10; the servo motor 9 is fixedly connected to the outer wall of the second fixed member 2 or the mechanical arm of the tunnel boring machine, and the output shaft 901 of the servo motor 9 is transmission-connected with the transmission gear 902, and the transmission gear 902 is meshingly connected with the transmission gear ring 701 fixedly sleeved on the outer side of the second circular ring member 7; the outer peripheral side wall of the second circular ring member 7 is fixedly connected to the folding bracket 8.

[0024] When the servo motor rotates, its output shaft drives the transmission gear and the transmission ring gear to move, thereby causing the second circular ring member, the folding bracket, and the water inlet pipe to rotate around the axis of the second fixed member. At the same time, the front end of the water inlet pipe will drive the first circular ring member to rotate around the axis of the first fixed member, thereby achieving a rotating water spraying effect of the water inlet pipe.

[0025] There are six folding brackets 8, and the six folding brackets 8 are arranged at equal intervals along the circumferential direction of the second circular ring member 7, and the six folding brackets 8 correspond to the six water inlet pipes 4; the folding bracket 8 includes an explosion-proof motor 803, an upper frame 802, and a lower frame 801. The length directions of the upper frame 802 and the lower frame 801 are consistent with the radial direction of the second circular ring member 7, one end of the lower frame 801 is fixedly connected or integrally formed with the outer peripheral side wall of the second circular ring member 7, and the other end of the lower frame 801 is fixedly connected by bolts to two symmetrically arranged explosion-proof motors 803, and the two explosion-proof motors 803 share an output shaft and the two explosion-proof motors 803 simultaneously perform rotational driving operation on the common output shaft; the outer fixed sleeve of the output shaft of the explosion-proof motor 803 is provided with a first snap-fitting member 8031, and the first snap-fitting member The axial direction of the fastener 8031 ​​is perpendicular to the length direction of the upper frame 802 and the lower frame 801; one end of the upper frame 802 is fixedly connected with a second fastener 8021, the second fastener 8021 is sleeved on the outside of the first fastener 8031 ​​and the second fastener 8021 is snap-connected with the first fastener 8031, and the other end of the upper frame 802 is provided with a snap-connection groove 8022 and is snap-connected with the outer wall of the water inlet pipe 4 through the snap-connection groove 8022; when the explosion-proof motor 803 drives the output shaft to rotate, the upper frame 802 and the second fastener 8021 and the first fastener 8031 ​​rotate and fold around the axis of the first fastener 8031, so that the water inlet pipe 4 is appropriately bent and deformed along with the folding bracket 8, thereby changing the water outlet range of the water nozzle 5.

[0026] The folding bracket can be used to adjust the nozzle direction of the water spray nozzle so that the water mist coverage area can be adjusted according to the actual requirements of the working surface, so as to improve the dust reduction effect; the side walls of the upper and lower frames in the folding bracket can be designed to be wider and thinner, similar to a fan blade structure. When the folding bracket rotates with the transmission assembly, the six folding brackets can form a simple fan system, which can blow the dust away from the cab, reducing damage to the cab staff, and can also accelerate the evaporation of the sprayed water mist, thereby improving the cooling effect.

[0027] Compared with traditional spray dust suppression devices, this device is more flexible, can cover the working area at multiple angles, can adapt to different working conditions, and has a wider dust suppression range, so it can more accurately target dust sources for dust suppression, greatly improving dust suppression efficiency; given that different types of coal mine dust have different particle sizes and characteristics, this device can flexibly adjust the spray parameters according to the specific characteristics of the dust to achieve the best dust suppression effect.

[0028] The steps for using the above-mentioned roadheader-mounted spray dust suppression device are as follows: S1. Complete the assembly and installation of the fixed component, folding bracket, transmission component, and water outlet component; S2. The first fixing member 1 and the second fixing member 2 in the fixing assembly are fixedly mounted on the outer side of the mechanical arm connecting the tunnel boring machine and the tunnel boring drill bit; when the installation is selected according to the tunnel boring machine entering the well, for example, when the tunnel boring machine is disassembled and then assembled underground, the equipment should also be transported to the well as a component for installation; if the equipment is entered into the well as a whole, it should be installed before entering the well; S3, inject water into the water injection pipe 6 through the water source pipeline, the water flows into the plurality of water inlet pipes 4 after passing through the receiving tank 101, and is sprayed out from the water spray nozzle 5 at the end of the water inlet pipe 4, and wait for 3-5 minutes to allow the sprayed water flow to reach a stable state; S4, control the explosion-proof motor 803 in the folding bracket 8 to rotate, so that the upper frame 802 drives the water inlet pipe 4 and the water nozzle 5 to extend or fold, and adjust the water spraying range of the water nozzle 5 to achieve a suitable state; generally speaking, the water circle range formed by the water spraying is compared with the size of the hole formed by the rock drilled by the tunnel boring machine, and the water circle diameter is 0.3m-0.5m larger than the hole diameter, which is the best; S5, start the servo motor 9, the second circular ring member 7, the folding bracket 8, the water inlet pipe 4, and the first circular ring member 3 rotate together around the mechanical arm of the tunnel boring machine, the rotation speed of the water inlet pipe 4 is generally 800-1000 rpm, so that the water flow sprayed from the water nozzle 5 forms a rotating water mist state; S6. Control the tunnel boring machine to perform face excavation operations. The rotating water mist will cover the dust generated during the excavation process. The rotating water mist has a wide coverage range and high flexibility, and can continuously provide stable water mist dust reduction for the excavation area, thereby reducing the flying and diffusion of dust and achieving the excavation dust reduction effect; about 3-5 minutes after the excavation operation is completed, stop the rotation of this device and the water supply operation of the water injection pipe.

[0029] The present invention is fixedly installed on the outside of the mechanical arm of the tunnel boring machine through a fixed component, and can perform spray dust reduction operations on the dust generated at the tunneling point during the tunneling process through the water outlet component, thereby realizing the dust cleaning work from the source, avoiding the dust from spreading from the tunneling point to the overall space and affecting the construction environment, so that the dust cleaning effect in the coal mining area can reach the ideal dust removal standard; and, by arranging a folding bracket structure on the outside of the fixed component, the present invention can adjust the water spray range of the water outlet component, so that it can form different water spray ranges for different tunneling points; at the same time, combined with the transmission component, the water outlet component can be rotated, and finally the water sprayed from the water nozzle in the water outlet component forms a rotating water mist state, which can adapt to different angles and positions, ensuring that every corner can be properly treated with dust reduction, and when facing some tunneling spaces with irregular shapes, the dust reduction effect can be effectively improved, which brings convenience to the dust removal and dust reduction operations in the coal mine tunneling construction area.

Claims

1. A spray dust suppression device mounted on a fully mechanized mining face tunneling machine, characterized in that: The tunnel boring machine-mounted spray dust suppression device includes a fixed component, a folding bracket, a transmission component, and a water outlet component. The fixed component is connected to the folding bracket through the transmission component, and the water outlet component is arranged between the folding bracket and the fixed component; the fixed component includes a first fixing part and a second fixing part, the first fixing part and the second fixing part are coaxially arranged and both are fixedly sleeved on the outside of the mechanical arm of the tunnel boring machine, the outer periphery of the first fixing part is rotatably connected to one end of the water outlet component, the other end of the water outlet component is connected to the transmission component through the folding bracket, and the transmission component is rotatably connected to the second fixing part.

2. The onboard spray dust suppression device for a fully mechanized mining face tunneling machine according to claim 1, characterized in that: The first fixing member is in the shape of an annular column, the inner wall of the first fixing member is fixedly connected to the mechanical arm of the tunnel boring machine, a receiving groove is arranged around the outer periphery of the first fixing member, a water injection pipe is fixedly connected to the end face of one axial end of the first fixing member, and one end of the water injection pipe is connected to the receiving groove.

3. The onboard spray dust suppression device for a fully mechanized mining face tunneling machine according to claim 2, characterized in that: The water outlet assembly includes a first circular ring member and a water inlet pipe. The inner circumferential side wall of the first circular ring member is rotatably connected to the outer circumferential side wall of the first fixed member through a first sealing bearing and encloses the receiving groove to form an annular sealing cavity. A plurality of water flow holes are arranged on the outer circumferential side wall of the first circular ring member at equal intervals along the circumferential direction of the first circular ring member; a plurality of water inlet pipes are arranged, and the plurality of water inlet pipes are arranged corresponding to the plurality of water flow holes. One end of the water inlet pipe is fixedly connected to the outer side wall of the first circular ring member and is connected to the receiving groove through the corresponding water flow hole. The other end of the water inlet pipe is connected to the folding bracket and the end is connected to a water nozzle.

4. The onboard spray dust suppression device for a fully mechanized mining face tunneling machine according to claim 3 is characterized in that: The transmission assembly includes a servo motor and a second circular ring member, wherein the second circular ring member is rotatably connected to one axial end of the second fixed member via a second sealed bearing; the servo motor is fixedly connected to the outer side wall of the second fixed member, and the output shaft of the servo motor is connected to the transmission gear, which is meshedly connected to the transmission gear ring fixedly sleeved on the outside of the second circular ring member; the outer periphery of the second circular ring member is connected to the folding bracket.

5. The onboard spray dust suppression device for a fully mechanized mining face tunneling machine according to claim 4, characterized in that: There are several folding brackets, which are arranged at equal intervals along the circumferential direction of the second circular ring member and correspond to several water inlet pipes; the folding bracket includes an explosion-proof motor, an upper frame, and a lower frame, one end of the lower frame is fixedly connected to the second circular ring member, and the other end of the lower frame is fixedly connected to the explosion-proof motor; one end of the upper frame is provided with a snap groove and is snap-connected to the outer wall of the water inlet pipe through the snap groove, and the other end of the upper frame is transmission connected to the explosion-proof motor.

6. The onboard spray dust suppression device for a fully mechanized mining face tunneling machine according to claim 5, characterized in that: The length direction of the upper frame and the lower frame is consistent with the radial direction of the second circular ring part, and a first clip is fixedly sleeved on the outer side of the output shaft of the explosion-proof motor, and the axial direction of the first clip is perpendicular to the length direction of the upper frame and the lower frame; one end of the upper frame is fixedly connected with a second clip, and the second clip is sleeved on the outside of the first clip and the second clip is engaged and connected with the first clip; when the explosion-proof motor drives the output shaft to rotate, the upper frame and the second clip and the first clip rotate and fold around the axis of the first clip.

7. The onboard spray dust suppression device for a fully mechanized mining face tunneling machine according to claim 6, characterized in that: There are two explosion-proof motors, and both are symmetrically arranged at one end of the lower frame. The two explosion-proof motors share an output shaft, and the two explosion-proof motors simultaneously perform a rotational driving operation on the shared output shaft.

8. The onboard spray dust suppression device for a fully mechanized mining face tunneling machine according to claim 7, characterized in that: The water inlet pipe is an L-shaped plastic pipe, one end of which is fixedly connected to the outer side wall of the first arc, and the other end of which is bent and snap-connected to one end of the upper frame.

9. The onboard spray dust suppression device for a fully mechanized mining face tunneling machine according to claim 8, characterized in that: The water injection pipes are provided with two and are symmetrically arranged on both sides of the end surface of the first fixing member, and one end of the water injection pipe away from the containing tank is connected to the water source pipeline or the gas source pipeline.

10. A method for using the onboard spray dust suppression device of a fully mechanized mining face tunneling machine as claimed in claim 9, characterized in that: The following steps are involved: S1. Complete the assembly and installation of the fixed component, folding bracket, transmission component, and water outlet component; S2, fixing the first fixing member and the second fixing member in the fixing assembly on the outside of the mechanical arm of the tunnel boring machine; S3, injecting water into the water injection pipe through the water source pipeline, the water flows into a plurality of water inlet pipes after passing through the receiving tank, and is sprayed out from the water spray nozzles at the ends of the water inlet pipes; S4, controlling the explosion-proof motor in the folding bracket to rotate, so that the upper frame drives the water inlet pipe and the water nozzle to extend or fold, and adjusting the water spraying range of the water nozzle to achieve a suitable state; S5, starting the servo motor, the second circular ring member, the folding bracket, the water inlet pipe, and the first circular ring member rotate together around the mechanical arm of the tunnel boring machine, so that the water flow sprayed from the water spray nozzle forms a rotating water mist state; S6. Control the tunnel boring machine to carry out excavation operations on the working face. The rotating water mist will cover the dust generated during the excavation process to achieve the excavation dust reduction effect.

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