A spray dust suppression system for a tunnel boring machine

Abstract

The present invention discloses a spray dust suppression system for a roadheader, which relates to the technical field of coal mine dust removal, and includes negative pressure capture mechanisms symmetrically arranged on the left and right sides of the roadheader cutting arm; and the negative pressure capture mechanism is located at the end of the roadheader cutting arm away from the cutting head; the negative pressure capture mechanism includes a dust collection housing, a high-pressure jet pipe, a primary atomization module, and a secondary atomization module; the top of the dust collection housing is provided with a dust collection pipe extending obliquely upward toward the roadheader cutting head; the jet section of the high-pressure jet pipe extends from the output port of the dust collection pipe to the interior thereof, and forms an annular gap with the inner wall of the dust collection pipe. Through multi-stage collaborative purification and structural innovation, the present invention significantly improves dust removal efficiency, while reducing energy and water consumption, and solves the pain points of traditional equipment such as the inability to approach dust sources, mechanical fragility, and frequent maintenance, providing an efficient, reliable, and sustainable dust removal solution for coal mine excavation working faces.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine dust removal, in particular to a spray dust reduction system for a roadheader. Background Art

[0002] During tunnel excavation operations, the high-speed friction between the cutting head and the rock formation will generate a large amount of high-concentration dust, which will cause the dust concentration in the air in the tunnel to increase significantly or even seriously exceed the standard. This high-concentration and highly dispersed dust seriously affects the working environment in the tunnel and endangers the health of workers.

[0003] The spray dust suppression system of traditional roadheaders generally has the following defects:

[0004] Inadequate dust source treatment: Existing technologies mostly use wet or dry dust removal equipment, but these typically intercept dust along its propagation path and cannot approach dust sources such as the cutting head, making it difficult to fundamentally address the dust problem.

[0005] Mechanical structural defects: Traditional dust removal fans rely on rotating blades to suck dust-laden gas. The blades are prone to dust accumulation and wear, requiring frequent maintenance. In addition, high-speed airflow can easily cause secondary dust. For example, patent publication number CN110578520B discloses a comprehensive dust removal system and method for mining roadheaders.

[0006] Waste of resources: Fixed spray patterns lack dynamic adjustment capabilities, often leading to water waste or equipment scaling due to excessive spraying. Summary of the Invention

[0007] The object of the present invention is to provide a spray dust suppression system for a roadheader to solve the problems raised in the above background technology.

[0008] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0009] The present invention provides a spray dust suppression system for a roadheader, comprising negative pressure capture mechanisms symmetrically arranged on the left and right sides of the roadheader's cutting arm; the negative pressure capture mechanism is located at the end of the roadheader's cutting arm away from the cutting head; the negative pressure capture mechanism comprises a dust suction housing, a high-pressure jet pipe, a primary atomization module, and a secondary atomization module;

[0010] A dust collection pipe is provided on the top of the dust collection housing, extending obliquely above the cutting head of the tunnel boring machine; the jet section of the high-pressure jet pipe extends from the output port of the dust collection pipe to the interior thereof, and forms an annular gap with the inner wall of the dust collection pipe; the primary atomization module is integrated into the high-pressure jet pipe, and is used to inject ultrafine droplets into the high-pressure jet pipe to form an aerosol mixed jet;

[0011] The dust collection housing is formed with a dust reduction channel whose input port is connected to the output port of the dust collection duct; the dust reduction channel includes, in order along the airflow direction, a guide section for guiding the airflow in, a circular arc guide section for guiding the airflow for centrifugal force classification, and a horizontal extension section for receiving the centrifugal separation product; the dust collection housing is provided with a spray channel and a dust exhaust channel connected to the interior of the dust collection housing on the side close to the cutting head, wherein the inlet end of the spray channel is embedded within the height range of the upper 1 / 3 of the cross-section of the horizontal extension section; and the inlet end of the dust exhaust channel is completely embedded within the cross-section of the horizontal extension section;

[0012] The secondary atomization module is installed in the isolation cavity above the horizontal extension section and is used to generate a wide-angle fog curtain covering the overlapping area of ​​the spray channel and the horizontal extension section.

[0013] Furthermore, the inlet end of the guide section is smoothly connected to the dust collecting pipe outlet, and the inlet of the arc guide section is tangentially connected to the guide section outlet, and the inlet of the arc guide section is tangentially connected to the horizontal extension section outlet.

[0014] Furthermore, the diameter of the jet section of the high-pressure jet pipe decreases continuously along the airflow direction to form a gradually contracting structure, and the width of the annular gap increases continuously along the airflow direction to form a gradually expanding structure.

[0015] Furthermore, inclined blades are evenly arranged on the outer side of the jet section, and spiral channels are formed between adjacent inclined blades.

[0016] Furthermore, the inner wall of the dust exhaust channel and the inner wall of the horizontal extension section are smoothly transitioned, and a hinged baffle is installed at the bottom of the spray channel on the front side of the dust exhaust channel through a hinged seat, and a controllable gap is retained between the hinged baffle and the dust exhaust channel outlet.

[0017] Furthermore, the dust reduction channel is composed of an arc-shaped partition arranged in the dust collection shell and the inner wall of the dust collection shell. The isolation cavity is formed on the inner side of the arc-shaped partition. A high-pressure cavity is provided in the isolation cavity in the middle of the arc-shaped partition, and flushing holes are evenly provided at the arc-shaped partition corresponding to the high-pressure cavity. The flushing holes are facing the arc surface outside the arc guide section, and the high-pressure cavity is connected to a high-pressure gas source through a connecting pipe.

[0018] Furthermore, the secondary atomization module includes a water injection pipe that is perpendicular to the horizontal extension section and horizontally rotated and arranged in the isolation cavity, and atomizing nozzles are evenly arranged on the outside of the water injection pipe along its length direction. One end of the water injection pipe is connected to the water supply pipeline of the external water supply source through a rotary joint, and the other end of the water injection pipe is connected to the rotating drive mechanism.

[0019] Furthermore, a humidity sensor is provided in the isolation cavity for monitoring the humidity of the fog curtain in real time and feeding back to the control system to adjust the spray intensity of the primary atomization module and the secondary atomization module.

[0020] Compared with the existing technology, one or more of the above technical solutions have the following beneficial effects:

[0021] 1. The present invention uses a negative pressure capture mechanism symmetrically installed near the cutting head of the tunnel boring machine, utilizing the Venturi effect to actively extract dust-laden gas diffused from the dust source, achieving immediate dust interception. This design abandons traditional fan blades and adopts a Venturi negative pressure dust extraction and a gradually converging and expanding flow channel design to avoid dust accumulation on the blades and reduce maintenance costs.

[0022] 2. The present invention injects ultrafine droplets through the first-stage atomization module, combines inertial collision to increase the weight of dust particles, and improves the subsequent centrifugal separation efficiency.

[0023] 3. This invention uses a centrifugal force classification design (circular arc guide section) to directionally settle coarse particles and discharge them through the dust exhaust channel. Fine dust is captured and discharged through the dynamic wide-angle mist curtain of the secondary atomization module through Brownian motion. The aerosol jet forms a dynamic droplet cloud in front of the cutting head, simultaneously achieving dust source suppression and diffusion interception, significantly improving working visibility and air quality.

[0024] 4. The present invention optimizes the energy transfer of gas-solid two-phase flow and reduces pipe wall wear by coupling the gradually converging jet pipe with the gradually expanding annular gap.

[0025] 5. The humidity sensor of the present invention monitors the status of the mist curtain in real time, and the linkage control system dynamically adjusts the atomization intensity to balance dust removal efficiency and water resource consumption; and the built-in high-pressure air curtain (flushing nozzle) continuously flushes the centrifugal separation area to prevent dust adhesion and ensure smooth flow.

[0026] 6. The primary atomization module and the secondary atomization module of the present invention are both located in the flowing airway, which can prevent the primary atomization module and the secondary atomization module from being blocked by dust accumulation.

[0027] In summary, the present invention significantly improves the dust removal efficiency through multi-stage collaborative purification and structural innovation, while reducing energy consumption and water consumption. It solves the pain points of traditional equipment such as the inability to get close to dust sources, mechanical wear and frequent maintenance, and provides an efficient, reliable and sustainable dust removal solution for coal mine comprehensive excavation working faces.

[0028] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic structural diagram of the negative pressure capture mechanism of the present invention from a first perspective;

[0032] Figure 3 2. It is a schematic diagram of the negative pressure capture mechanism of the present invention from a top view;

[0033] Figure 4 yes Figure 3 AA structural diagram;

[0034] Figure 5 This is a schematic structural diagram of the negative pressure capture mechanism of the present invention from a second perspective;

[0035] Figure 6 yes Figure 1 A side structural diagram of

[0036] Figure 7 It is a simplified structural diagram of the working process of the negative pressure capture mechanism of the present invention.

[0037] In the picture:

[0038] 1-cutting arm; 2-negative pressure capture mechanism; 3-dust suction shell; 31-dust collection pipe; 32-dust reduction channel; 321-guide section; 322-arc guide section; 323-horizontal extension section; 324-arc partition; 33-spray channel; 34-dust exhaust channel; 341-hinged baffle; 342-controllable gap; 35-isolation chamber; 4-high-pressure jet pipe; 41-jet section; 411-inclined blades; 42-annular gap; 5-first-stage atomization module; 6-second-stage atomization module; 61-water injection pipe; 62-atomization nozzle; 7-high-pressure chamber; 71-flushing nozzle hole. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0040] See also Figure 1-Figure 7The present invention provides a spray dust reduction system for a tunnel boring machine, comprising a negative pressure capture mechanism 2 symmetrically arranged on the left and right sides of a cutting arm 1 of the tunnel boring machine; and the negative pressure capture mechanism 2 is located at the end of the cutting arm 1 of the tunnel boring machine away from the cutting head; the negative pressure capture mechanism 2 comprises a dust suction shell 3, a high-pressure jet pipe 4, a primary atomization module 5 and a secondary atomization module 6.

[0041] like Figure 4 As shown, a dust collecting pipe 31 is provided on the top of the dust collecting housing 3, which extends obliquely upward from the cutting head of the tunnel boring machine; the jet section 41 of the high-pressure jet pipe 4 extends from the output port of the dust collecting pipe 31 to the interior thereof, and forms an annular gap 42 with the inner wall of the dust collecting pipe 31; the first-stage atomization module 5 is integrated into the high-pressure jet pipe 4, and is used to inject ultrafine droplets into the high-pressure jet pipe 4 to form an aerosol mixed jet.

[0042] The dust collection shell 3 is formed with a dust reduction channel 32 whose input port is connected to the output port of the dust collection pipe 31; the dust reduction channel 32 includes, in sequence along the direction of air flow, a guide section 321 for guiding the air flow to enter, an arc guide section 322 for guiding the air flow for centrifugal force classification, and a horizontal extension section 323 for receiving the centrifugal separation product; the dust collection shell 3 is provided with a spray channel 33 and a dust exhaust channel 34 connected to the interior of the dust collection shell 3 on the side close to the cutting head, wherein the inlet end of the spray channel 33 is embedded in the height range of the upper 1 / 3 of the cross section of the horizontal extension section 323; the inlet end of the dust exhaust channel 34 is completely embedded in the cross section of the horizontal extension section 323.

[0043] The secondary atomization module 6 is installed in the isolation cavity 35 above the horizontal extension section 323 and is used to generate a wide-angle mist curtain covering the overlapping area of ​​the spray channel 33 and the horizontal extension section 323 .

[0044] Combine Figure 4 and Figure 7 As shown, the tunnel boring machine's spray dust suppression system achieves multi-stage dust removal based on the synergistic effect of the Venturi effect and centrifugal force classification. Specifically, when the high-pressure jet pipe 4 injects a high-speed airflow into the dust collection duct 31, the local negative pressure formed in the annular gap 42 actively draws the diffused dust-laden gas produced by the cutting head into the system. During this process, the primary atomization module 5 injects ultrafine droplets into the airflow of the high-pressure jet pipe 4. The ultrafine droplets and the dust-laden gas collide in the dust collection duct 31 through inertial collision, which increases the weight of the dust particles in the dust-laden gas and significantly improves the subsequent separation efficiency.

[0045] After the dust-carrying aerosol mixture completes the flow field shaping in the guide section 321, it enters the arc guide section 322 for centrifugal separation. The weighted dust particles are subjected to the centrifugal force and settle close to the outer wall surface. Driven by the airflow, they are discharged in a direction from the dust exhaust channel 34 which is fully embedded in the horizontal extension section 323. The airflow carrying fine dust rises to the upper part of the horizontal extension section 323. During this process, the wide-angle mist curtain generated by the secondary atomization module 6 in the isolation cavity 35 covers the overlapping area of ​​the spray channel 33 and the horizontal extension section 323, and the residual micron-sized dust is captured for a second time through Brownian motion. At the same time, the atomized jet carries the mist droplets and is ejected from the spray channel 33 at high speed, forming a dynamic mist cloud barrier in front of the cutting head (such as Figure 6 As shown in the figure), the present invention avoids the dust accumulation problem of traditional fan blades by using a non-mechanical rotating structure (Venturi negative pressure dust extraction), and combines multi-stage atomization and centrifugal separation to achieve dual dust suppression at the source and interception of diffused dust.

[0046] In this embodiment, the guide section 321 is smoothly connected to the output port of the dust collecting duct 31 to ensure that the flow field is continuous and stable when the dust-laden airflow enters the guide section 321 from the dust collecting duct 31, thereby avoiding energy loss or turbulent disturbance caused by sudden changes in cross-section. The inlet of the circular arc guide section 322 and the outlet of the guide section 321 and the outlet of the horizontal extension section 323 all adopt a tangential connection design, so that the aerosol mixture enters tangentially along the inner wall of the circular arc guide section 322, and naturally forms a high-speed rotating flow field through the geometric constraints of the flow channel. This tangential guide structure enhances the centrifugal separation effect, so that the weighted particles are fully subjected to the centrifugal force when they spiral along the outer wall of the circular arc section, while maintaining the axial momentum of the airflow, thereby achieving directional sedimentation of coarse particles and laminar separation of the purified airflow.

[0047] like Figure 4 As shown, in this embodiment, the diameter of the jet section 41 of the high-pressure jet pipe 4 continuously decreases along the airflow direction, forming a tapered structure. This cross-sectional contraction creates an accelerated airflow field, leveraging the Bernoulli effect to increase the atomizing medium velocity and reduce local static pressure, thereby enhancing the kinetic energy and diffusion uniformity of the atomized particles. The corresponding annular gap 42 continuously increases in width along the airflow direction, forming a gradually expanding structure. This expansion channel creates a controllable pressure gradient, promoting thorough mixing of the atomized particles with the airflow while utilizing the gradually expanding boundary layer effect to suppress turbulence and achieve laminar, stable transport of the aerosol flow (dust-laden gas). The dynamic coupling of the tapered and gradually expanding structures not only optimizes the energy transfer efficiency of the gas-solid two-phase flow, but their symmetrical and complementary geometric features also effectively reduce the scouring effect of the high-speed airflow on the pipe wall through an adaptive pressure balance mechanism, significantly reducing the risk of wear and ensuring the structural integrity of the system under long-term high-dust conditions.

[0048] Combine Figure 4 and Figure 5As shown, in this embodiment, inclined blades 411 are evenly arranged on the outside of the jet section 41, and a spiral channel is formed between adjacent inclined blades 411. The inclined blades 411 transform the axial airflow into a high-intensity spiral turbulent flow field. The tangential shearing effect effectively breaks up dust agglomerates and refines the particle distribution, promoting thorough mixing of the atomized particles with the airflow.

[0049] Furthermore, a conical expansion cover is installed at the input port of the dust collecting pipe 31 to increase the dust collection range.

[0050] like Figure 4 As shown, in this embodiment, the inner wall of the dust exhaust channel 34 and the inner wall of the horizontal extension section 323 are smoothly transitioned to eliminate the local eddy current zone caused by the traditional right-angle connection, and suppress the risk of dust deposition at the corners due to turbulent disturbance. The bottom of the spray channel 33 on the front side of the dust exhaust channel 34 is installed with a hinged baffle 341 through a hinged seat, and a controllable gap 342 is retained between the hinged baffle 341 and the outlet of the dust exhaust channel 34. When the airflow carrying coarse particles hits the hinged baffle 341, the baffle is deflected around the hinged seat by the fluid pressure, and adaptive opening adjustment is achieved through the controllable gap 342 formed between the baffle and the outlet of the dust exhaust channel 34, which not only ensures the efficient discharge of large particles, but also prevents secondary dust caused by the backflow of external airflow.

[0051] In this embodiment, the dust reduction channel 32 is formed by an arc-shaped partition 324 disposed within the dust collection housing 3 and the inner wall of the dust collection housing 3. The inner side of the arc-shaped partition 324 forms the isolation chamber 35. A high-pressure chamber 7 is disposed within the isolation chamber 35 in the middle of the arc-shaped partition 324. Flushing nozzles 71 are evenly distributed on the arc-shaped partition 324 at locations corresponding to the high-pressure chamber 7. The flushing nozzles 71 face the arc surface outside the arc guide section 322. The high-pressure chamber 7 is connected to a high-pressure gas source via a connecting pipe. The isolation chamber 35 formed by the arc-shaped partition 324 not only provides installation space for the secondary atomization module 6, but also forms a directional airflow cleaning mechanism after the high-pressure chamber 7 disposed therein is connected to the high-pressure gas source via a connecting pipe. When the dust-carrying airflow undergoes centrifugal separation in the arc guide section 322, the compressed gas accumulated in the high-pressure chamber 7 is ejected at high speed through the evenly distributed flushing nozzles 71, forming a dynamic air curtain barrier along the outer wall of the arc guide section 322. This air curtain optimizes system performance through the following dual effects: First, high-speed airflow continuously scours the arc surface, disrupting dust adhesion in the centrifugal concentration zone and eliminating the risk of flow channel blockage caused by particle accumulation in traditional structures. Second, the shear disturbance generated by the air curtain counteracts the movement of particles after centrifugal separation, accelerating the settling of coarse particles toward the horizontal extension section 323 while preventing the secondary entrainment of separated dust. This built-in self-cleaning structure enables the system to dynamically maintain centrifugal separation efficiency during continuous operation. Combined with the wide-angle mist curtain of the secondary atomization module 6, it forms a composite dust removal mode, significantly extending the equipment's continuous operation cycle.

[0052] In this embodiment, the secondary atomization module 6 includes a water injection pipe 61 that is arranged perpendicular to the horizontal extension section 323 and rotates horizontally within the isolation chamber 35. Atomizing nozzles 62 are evenly distributed along the outer side of the water injection pipe 61 along its length. One end of the water injection pipe 61 is connected to a water supply pipeline from an external water source via a rotary joint, and the other end of the water injection pipe 61 is connected to a rotary drive mechanism (not shown). During use, a high-pressure water flow is continuously supplied to the water injection pipe 61 through the water supply pipeline. As the water flows through the atomizing nozzles 62 evenly distributed along the length of the pipe, it is sheared and broken into micron-sized droplets. The rotary drive mechanism (which can be a motor) drives the water injection pipe 61 to rotate reciprocally about its own axis, causing the water injection pipe 61 to synchronously deflect the outer array of nozzles, forming a dynamic spray angle at an angle of 30-60° with the axis of the horizontal extension section 323, thereby constructing a three-dimensional fog curtain covering more than two-thirds of the cross-sectional height within the overlapping area of ​​the spray channel 33 and the horizontal extension section 323.

[0053] This design has an enhanced dust removal effect: first, the rotational motion of the rotating water injection pipe 61 causes the atomizing nozzle 62 to produce a periodic sweeping spray, breaking through the coverage blind spot of the traditional fixed nozzle; second, the arrangement direction of the atomizing nozzle 62 perpendicular to the horizontal extension section 323 enables the droplet jet to directly penetrate the motion trajectory of the rising air flow, thereby enhancing the probability of intercepting suspended dust through Brownian motion.

[0054] In this embodiment, a humidity sensor is installed within the isolation chamber 35 to monitor the humidity of the mist curtain in real time and provide feedback to the control system to adjust the spray intensity of the primary atomization module 5 and the secondary atomization module 6. The humidity sensor monitors the humidity distribution of the wide-angle mist curtain in real time and transmits this data to the control system. When the sensor detects that the humidity of the mist curtain is below a critical value, the control system simultaneously increases the supply of ultrafine droplets from the primary atomization module 5 and the rotation speed of the water injection pipe 61 of the secondary atomization module 6, improving the efficiency of droplet generation and increasing the coverage density of the wide-angle mist curtain. Conversely, when the humidity is too high, the intensity of both stages of atomization is reduced to prevent equipment scaling caused by excessive humidity. This ensures that the droplet concentration is always dynamically matched to the dust load. This not only improves Brownian motion capture efficiency by increasing the humidity of the mist curtain under high-concentration dust conditions, but also automatically enters water-saving mode during low-dust periods, combining with the centrifugal force graded dust removal mechanism to achieve an optimal balance between dust reduction efficiency and water consumption.

[0055] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A spray dust suppression system for a roadheader, characterized in that: The invention comprises a negative pressure capture mechanism symmetrically arranged on the left and right sides of the cutting arm of the roadheader; the negative pressure capture mechanism is located at the end of the cutting arm of the roadheader away from the cutting head; the negative pressure capture mechanism comprises a dust collection housing, a high-pressure jet pipe, a primary atomization module and a secondary atomization module; A dust collection pipe is provided on the top of the dust collection housing, extending obliquely above the cutting head of the tunnel boring machine; the jet section of the high-pressure jet pipe extends from the output port of the dust collection pipe to the interior thereof, and forms an annular gap with the inner wall of the dust collection pipe; the primary atomization module is integrated into the high-pressure jet pipe, and is used to inject ultrafine droplets into the high-pressure jet pipe to form an aerosol mixed jet; The dust collection housing is formed with a dust reduction channel whose input port is connected to the output port of the dust collection duct; the dust reduction channel includes, in order along the airflow direction, a guide section for guiding the airflow in, a circular arc guide section for guiding the airflow for centrifugal force classification, and a horizontal extension section for receiving the centrifugal separation product; the dust collection housing is provided with a spray channel and a dust exhaust channel connected to the interior of the dust collection housing on the side close to the cutting head, wherein the inlet end of the spray channel is embedded within the height range of the upper 1 / 3 of the cross-section of the horizontal extension section; and the inlet end of the dust exhaust channel is completely embedded within the cross-section of the horizontal extension section; The secondary atomization module is installed in the isolation cavity above the horizontal extension section and is used to generate a wide-angle mist curtain covering the overlapping area of ​​the spray channel and the horizontal extension section; The dust reduction channel is composed of an arc-shaped partition arranged in the dust collection shell and the inner wall of the dust collection shell. The isolation cavity is formed on the inner side of the arc-shaped partition. A high-pressure cavity is arranged in the isolation cavity in the middle of the arc-shaped partition, and flushing holes are evenly arranged on the arc-shaped partition corresponding to the high-pressure cavity. The flushing holes are facing the arc surface outside the arc guide section, and the high-pressure cavity is connected to a high-pressure gas source through a connecting pipe.

2. The spray dust suppression system for a roadheader according to claim 1, characterized in that: The inlet end of the guide section is smoothly connected to the dust collecting pipe outlet, and the inlet of the arc guide section is tangentially connected to the guide section outlet, and the inlet of the arc guide section is tangentially connected to the horizontal extension section outlet.

3. The spray dust suppression system for a roadheader according to claim 1, characterized in that: The diameter of the jet section of the high-pressure jet pipe decreases gradually along the airflow direction to form a gradually contracting structure, and the width of the annular gap increases gradually along the airflow direction to form a gradually expanding structure.

4. The spray dust suppression system for a roadheader according to claim 3, characterized in that: Inclined blades are evenly arranged on the outer side of the jet section, and spiral channels are formed between adjacent inclined blades.

5. The spray dust suppression system for a roadheader according to claim 1, characterized in that: The inner wall of the dust exhaust channel and the inner wall of the horizontal extension section are smoothly transitioned, and a hinged baffle is installed at the bottom of the spray channel on the front side of the dust exhaust channel through a hinged seat, and a controllable gap is retained between the hinged baffle and the dust exhaust channel outlet.

6. The spray dust suppression system for a roadheader according to claim 1, characterized in that: The secondary atomization module includes a water injection pipe that is perpendicular to the horizontal extension section and horizontally rotated and arranged in the isolation cavity. Atomizing nozzles are evenly arranged on the outside of the water injection pipe along its length. One end of the water injection pipe is connected to the water supply pipeline of the external water supply source through a rotary joint, and the other end of the water injection pipe is connected to the rotary drive mechanism.

7. The spray dust suppression system for a roadheader according to claim 1, characterized in that: A humidity sensor is provided in the isolation cavity for monitoring the humidity of the fog curtain in real time and feeding back to the control system to adjust the spray intensity of the primary atomization module and the secondary atomization module.

Images