A wet dust suppression system for hole enlarging cutter disc

Abstract

The present invention discloses a wet dust reduction system for a hole enlarging cutter head, and specifically relates to the technical field of hole enlarging equipment for a skylight drilling rig, comprising a cutter head arranged at the top of a tunnel and directly below a guide hole, a hollow pull rod being arranged in the middle of the top surface of the cutter head, and a dust reduction assembly being installed on the bottom surface of the cutter head, and a drill rod for inputting pressurized water being installed on the top of the pull rod. The present invention sets a telescopic dustproof assembly, and the dustproof cloth is pulled upward by a pressure frame until the upper surface of a fixed frame plate is in close contact with the top surface of the inner cavity of the tunnel, so as to form a sealed dustproof space, improve the working environment of the tunnel, avoid affecting the operation of other types of work in the tunnel, and the dust generated by hole enlarging is not easy to spread in the tunnel, and the dust reduction assembly is used to reduce the dust generated during hole enlarging; the slag generated during hole enlarging falls into a feed trolley under the action of gravity for centralized collection, and when the feed trolley is full of slag, it is discharged to the tunnel entrance along the track, and will not cause the tunnel to be blocked, and the safety is high.

Description

Technical Field

[0001] The invention relates to the technical field of hole enlarging equipment for a well boring machine, and in particular to a wet dust reduction system for an enlarging cutter disc. Background Art

[0002] The hole reaming operation of a shaft drilling rig refers to the process of using a roller drill bit to drill a pilot hole horizontally downward (upward) in the upper (lower) horizontal tunnel, and then using the reaming cutter head to reaming the hole from bottom (top) to top (down) to form a well after drilling through; this operation is widely used in mining, geological exploration and other fields.

[0003] The reaming cutterhead is mainly composed of a pull rod, a hob, a blade and a box. During the reaming operation, when the cutterhead cuts rocks, dust will fly in the hole with the falling rock debris. The cutterhead has a large amount of rock breaking capacity, and the slag falling process will generate a large amount of dust, causing the entire cutterhead operation tunnel to be covered with dust, affecting other types of work. In previous operations, only a passive solution of slow slag discharge could be adopted. The method of not discharging slag in the early stage was used to fill the hole entrance with fallen slag in order to seal the dust in the constructed wellbore. This method adds a lot of management troubles to slag discharge, and the amount of slag blocking the hole is also difficult to control, resulting in the risk of slag blocking the upper part of the wellbore. At the same time, the greater risk is that after too much slag is accumulated, it is very easy to cause uncontrolled rock debris collapse during the slag discharge process, posing a great threat to personnel safety. Summary of the invention

[0004] The object of the present invention is to provide a wet dust reduction system for a hole-enlarging cutter disc to solve the problems mentioned in the above background technology.

[0005] The present invention can be implemented through the following technical scheme: a wet dust reduction system for a hole-reaming cutter disc, comprising a cutter disc arranged at the top of a tunnel and directly below a guide hole, a pull rod of a hollow structure being arranged in the middle of the top surface of the cutter disc, and a dust reduction assembly being installed on the bottom surface of the cutter disc, a drill rod for inputting pressurized water being installed on the top of the pull rod, a track 1 and a track 2 being installed on the bottom surface of the inner cavity of the tunnel, the ends of the track 1 and the track 2 being close to the hole opening, and a feed trolley for collecting slag being rotatably installed on the track 1 and the track 2, and a telescopic dust prevention assembly for contacting the feed trolley with the top surface of the inner cavity of the tunnel being arranged on the top of the feed trolley;

[0006] The telescopic dustproof component includes a fixed frame plate arranged on the outer wall surface of the top of the feeding trolley, the upper surface of the fixed frame plate is provided with a dustproof cloth, the top end of the dustproof cloth is fixedly connected with a pressure frame, and the pressure frame is located outside the cutter disc.

[0007] A further technical improvement of the present invention is that a fixed block is provided on the top outer wall surface of the feed trolley and below the fixed frame plate, a stroke cylinder is installed on the surface of the fixed block, and a pushing end of the stroke cylinder is fixed to the bottom surface of the pressure frame.

[0008] A further technical improvement of the present invention is that: the inner cavity of the material conveying trolley is provided with a bearing plate for slag accumulation, and the inner cavity of the material conveying trolley and located below the bearing plate is a water seepage cavity, and the surface of the bearing plate is penetrated with a plurality of water seepage step ring holes, and the water seepage step ring holes include a first through hole and a second through hole, and the first through hole is located above the second through hole and is connected;

[0009] A waterproof electric push rod is installed on the bottom surface of the inner cavity of the feeding trolley, a push plate is installed on the pushing end of the electric push rod, and a plurality of ejectors used in conjunction with corresponding water seepage step ring holes are arranged on the upper surface of the push plate.

[0010] A further technical improvement of the present invention is that a track-changing tooling is installed at the switch of the track 2 close to the track 1.

[0011] A further technical improvement of the present invention is that a baffle is provided at the end of the track one to limit the feed trolley, a drainage outlet communicated with the water seepage cavity is provided on one side outer wall of the feed trolley, and a support seat is provided under the feed trolley, and the support seat is rotatably connected to the feed trolley.

[0012] A further technical improvement of the present invention is that the cutter disc includes a box body with a mounting hole body, four blade wings are installed on the outside of the box body, rollers are provided on the upper surfaces of the blade wings and the box body, an entry groove is provided on the lower surface of the box body, and a through groove and a discharge groove are provided on the outer surface of the blade wings in sequence.

[0013] A further technical improvement of the present invention is that the dust reduction component includes a water spray flange arranged in the middle of the bottom surface of the box body, the water spray flange is connected to the box body and the pull rod, and fan-shaped water mist spray units operating on the bottom of the cutter disc are symmetrically installed on both sides of the water spray flange. The fan-shaped water mist spray unit includes a dust removal distribution pipe with a fan-shaped structure and a water outlet pipe arranged on both sides of the water spray flange, and both ends of the water outlet pipe are installed with a hose three connected to the inner side surface of the dust removal distribution pipe, and nozzle two are installed on the bottom and side surfaces of the dust removal distribution pipe.

[0014] A further technical improvement of the present invention lies in that: circumferential side water mist spray units operating on the periphery of the cutter disc are symmetrically arranged on the other two sides of the water spray flange, and the circumferential side water mist spray units include a hose 1 connected to the water spray flange, and the end of the hose 1 is fixedly connected to a switching tube passing through the inside of the groove, and the end of the switching tube is provided with a hose 2, and the end of the hose 2 is fixedly connected to a water spray pipe passing through the inside of the groove, and the end of the water spray pipe is fixedly connected to a nozzle 1 passing through the inside of the discharge groove and facing the outside of the circumferential side of the cutter disc, and buckles are installed at the connections between the dust removal distribution pipe, the hose 1, the switching tube and the cutter disc.

[0015] A further technical improvement of the present invention is that a bottom bracket for supporting the cutter disc is installed on the bottom surface of the box body and below the water spray flange.

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

[0017] 1. By setting up a telescopic dustproof component, the dustproof cloth is pulled upward by the pressure frame until the upper surface of the fixed frame plate is in contact with the top surface of the inner cavity of the tunnel, forming a sealed dustproof space, improving the working environment of the tunnel, and avoiding affecting the operations of other types of work in the tunnel. The dust generated by hole expansion is not easy to spread in the tunnel. With the help of the dust reduction component, the dust generated during hole expansion can be reduced. The slag generated during hole expansion falls into the feed trolley under the action of gravity and is collected together. When the feed trolley is full of slag, it is discharged to the entrance along the track, which will not cause the tunnel to be blocked, and has high safety.

[0018] 2. When collecting slag, the top of the ejector pin enters the corresponding seepage step ring hole, and the slag produced by the hole expansion falls to the upper surface of the bearing plate and is blocked by the ejector pin to prevent the slag from entering the seepage cavity through the seepage step ring hole. After the upper surface of the bearing plate is covered with slag, the ejector pin leaves the corresponding seepage step ring hole, increasing the flow rate of seepage water, and the slag sprayed by the dust suppression component penetrates into the seepage cavity through the seepage step ring hole to achieve solid-liquid separation of the slag;

[0019] 3. After the feeding trolley is full of slag, it reaches the hole entrance from track 1. Another feeding trolley changes track through the track change tooling at the turnout, and the feeding trolley reaches the end of track 1, that is, just below the guide hole, to realize the relay collection of slag;

[0020] 4. By setting up a fan-shaped water mist spray unit and a circumferential side water mist spray unit, high-pressure water flows into the dust removal distribution pipe and the water spray pipe, and high-pressure water mist is sprayed toward the circumferential side outer wall of the cutter disc through nozzle 2, and fan-shaped high-pressure water mist is sprayed toward the bottom of the cutter disc in different directions of nozzle 1 to wet the dust and prevent the dust from spreading around. The coverage area is large and the dust removal effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a structural cross-sectional view of the present invention when in use;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the cutter head of the present invention;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the bottom of the cutter head of the present invention;

[0025] Figure 4It is a schematic diagram of the three-dimensional structure of the dust reduction assembly of the present invention;

[0026] Figure 5 It is a schematic diagram of the planar structure of the dust reduction assembly of the present invention;

[0027] Figure 6 For the present invention Figure 1 A partial enlarged view of the middle A;

[0028] Figure 7 It is a schematic diagram of the installation structure of the turnout tooling of the present invention.

[0029] In the figure: 1. box body; 2. blade; 3. pull rod; 4. hob; 5. dust removal distribution pipe; 6. bottom bracket; 7. water spray flange; 8. entry slot; 9. through slot; 10. discharge slot; 11. buckle seat; 12. hose 1; 13. adapter tube; 14. hose 2; 15. water spray pipe; 16. nozzle 1; 17. water outlet pipe; 18. hose 3; 19. fixed frame plate; 20. drill rod; 21. track 1; 22. feed trolley; 23. baffle; 24. electric push rod; 25. load-bearing transparent plate; 26. dustproof cloth; 27. through hole 1; 28. through hole 2; 29. ​​push plate; 30. ejector pin; 31. fixed block; 33. stroke cylinder; 34. press frame; 35. track 2; 36. track change tooling. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0031] See also Figure 1-Figure 7As shown, the present invention provides a wet dust reduction system for a hole-expanding cutter disc, comprising a cutter disc arranged at the top of the tunnel and directly below the guide hole, a pull rod 3 of a hollow structure is arranged in the middle of the top surface of the cutter disc, and a dust reduction assembly is installed on the bottom surface of the cutter disc, a drill rod 20 for inputting pressurized water is installed on the top of the pull rod 3, a track 1 21 and a track 2 35 are installed on the bottom surface of the inner cavity of the tunnel, the ends of the track 1 21 and the track 2 35 are close to the hole opening, and a feed trolley 22 for collecting debris is rotatably installed on the track 1 21 and the track 2 35, a telescopic dust-proof assembly for contacting the feed trolley 22 with the top surface of the inner cavity of the tunnel is arranged on the top of the feed trolley 22, the telescopic dust-proof assembly comprises a fixed frame plate 19 arranged on the outer wall surface of the top of the feed trolley 22, a dust-proof cloth 26 is arranged on the upper surface of the fixed frame plate 19, a pressure frame 34 is fixedly connected to the top of the dust-proof cloth 26, and the pressure frame 34 is located at the cutter disc When the hole is expanded, the feeding trolley 22 on the track 21 reaches the bottom of the hole expansion position and is expanded and opened upward by the telescopic dustproof component. At this time, the pressure frame 34 pulls the dustproof cloth 26 upward until the upper surface of the fixed frame plate 19 is in contact with the top surface of the inner cavity of the laneway, forming a sealed dustproof space, improving the working environment of the laneway, and avoiding affecting the operation of other types of work in the laneway. When the hole is expanded, the drill rod 20 provides rotation and upward power, and drives the cutter head to rotate together through the pull rod 3. The cutter head moves upward from the bottom of the guide hole, and the dust generated by the hole expansion is not easy to spread in the laneway. At the same time, the dust reduction component is used to reduce the dust generated during the hole expansion. In addition, the slag generated during the hole expansion falls into the feeding trolley 22 under the action of gravity and is collected together. When the feeding trolley 22 is full of slag, it is discharged to the hole entrance along the track 21, which will not cause the lane to be blocked, and the safety is high.

[0032] See also Figure 6 As shown, a fixed block 31 is provided on the top outer wall of the feed trolley 22 and below the fixed frame plate 19, and a stroke cylinder 33 is installed on the surface of the fixed block 31. The pushing end of the stroke cylinder 33 is fixed to the bottom surface of the pressing frame 34. After the feed trolley 22 reaches directly below the guide hole, the stroke cylinder 33 pushes the pressing frame 34 vertically upward until it contacts the top surface of the inner cavity of the laneway. When the pressing frame 34 moves upward, it pulls the dustproof cloth 26 to retract and expand, forming a sealed space.

[0033] See also Figure 1 and Figure 6 As shown, a supporting plate 25 for slag accumulation is provided in the inner cavity of the feeding trolley 22, and the inner cavity of the feeding trolley 22 and located below the supporting plate 25 is a water seepage cavity, and a plurality of water seepage step ring holes are provided through the surface of the supporting plate 25, and the water seepage step ring holes include a first through hole 27 and a second through hole 28, and the first through hole 27 is located above the second through hole 28 and is connected;

[0034] A waterproof electric push rod 24 is installed on the bottom surface of the inner cavity of the feeding trolley 22, and a push plate 29 is installed on the pushing end of the electric push rod 24. A plurality of ejector pins 30 used in conjunction with corresponding water seepage step ring holes are arranged on the upper surface of the push plate 29. Initially, the push plate 29 is pushed upward by the electric push rod 24 so that the top of the ejector pin 30 enters the corresponding water seepage step ring hole, and the slag produced by the hole expansion falls to the upper surface of the bearing transparent plate 25 and is blocked by the ejector pin 30 to prevent the slag from entering the water seepage cavity through the water seepage step ring hole. After the upper surface of the bearing transparent plate 25 is covered with slag, the ejector pin 30 leaves the corresponding water seepage step ring hole, thereby increasing the flow rate of water seepage, and the slag after being sprayed by the dust reduction component penetrates into the water seepage cavity through the water seepage step ring hole, thereby realizing the solid-liquid separation of the slag.

[0035] See also Figure 1 and Figure 7 As shown, a track change fixture 36 is installed at the turnout of track 2 35 close to track 1 21, and according to the track change on the track change fixture 36, two feeder trolleys 22 roll on track 1 21 and track 2 35;

[0036] A baffle 23 is provided at the end of track 1 21 to limit and block the feed trolley 22, a drainage port communicated with the water seepage cavity is provided on one side outer wall of the feed trolley 22, and a support seat is provided below the feed trolley 22, which is rotatably connected to the feed trolley 22. Initially, one feed trolley 22 rolls on track 1 21 and is located directly below the guide hole, and the other feed trolley 22 is located on track 2 35, and the feed trolley 22 is blocked by the baffle 23, and then the telescopic dustproof component is started to collect the slag for hole expansion. After the feed trolley 22 is full of slag, it reaches the hole entrance from track 1 21, and the other feed trolley 22 changes track through the track changing tooling 36 at the switch, and the feed trolley 22 arrives at the end of track 1 21, that is, directly below the guide hole, to realize the relay collection of the slag.

[0037] See also Figure 2 and Figure 3 As shown, the cutter disc includes a box body 1 with a mounting hole body, and four blade wings 2 are installed on the outside of the box body 1. The blade wings 2 and the upper surface of the box body 1 are provided with rollers 4. As the cutter disc rotates, the teeth on the rollers 4 produce impact and shearing effects on the rocks, so that the rocks are separated from the rock mass and broken. The lower surface of the box body 1 is provided with an entry groove 8, and the outer surface of the blade wings 2 is provided with a through groove 9 and a discharge groove 10 in sequence.

[0038] See also Figure 3 and Figure 4As shown, the dust reduction component includes a water spray flange 7 arranged in the middle of the bottom surface of the box body 1, the water spray flange 7 is connected to the box body 1 and the pull rod 3, and fan-shaped water mist spray units operating on the bottom of the cutter disc are symmetrically installed on both sides of the water spray flange 7. The fan-shaped water mist spray unit includes a dust removal distribution pipe 5 with a fan-shaped structure and a water outlet pipe 17 arranged on both sides of the water spray flange 7. Both ends of the water outlet pipe 17 are equipped with a hose three 18 connected to the inner side of the dust removal distribution pipe 5, and the bottom and side of the dust removal distribution pipe 5 are installed with nozzles two. During dust reduction, pressurized water is sent into the water spray flange 7 at the bottom of the cutter disc through the center of the drill rod 20, and high-pressure water flow is sprayed from the water spray flange 7 and enters the fan-shaped dust removal distribution pipe 5 through the connection of the water outlet pipe 17 and the hose three 18 in turn, and fan-shaped water mist is sprayed through the nozzle two, with a large coverage area and good dust removal effect.

[0039] See also Figure 3 and Figure 5 As shown, the other two sides of the water spray flange 7 are symmetrically provided with circumferential side water mist spray units operating on the periphery of the cutter disc, and the circumferential side water mist spray units include a hose 12 connected to the water spray flange 7, and the end of the hose 12 is fixedly connected with a transfer tube 13 passing through the inside of the groove 8, and the end of the transfer tube 13 is provided with a hose 2 14, and the end of the hose 2 14 is fixedly connected with a water spray pipe 15 passing through the inside of the through groove 9, and the end of the water spray pipe 15 is fixedly connected with a nozzle 16 passing through the inside of the discharge groove 10 and facing the outside of the circumferential side of the cutter disc. The connection between the dust removal distribution pipe 5, the hose 12, the transfer tube 13 and the cutter disc is equipped with a buckle seat 11. The water spray flange 7 will reach the water spray pipe 15 through the hose 12, the transfer tube 13 and the hose 2 14 at the same time, and the nozzle 16 will spray high-pressure water mist toward the circumferential side outer wall of the cutter disc, and cooperate with the use of the bottom nozzle 2 to wet the dust and prevent the dust from spreading to the surrounding.

[0040] See also Figure 3 As shown, a bottom bracket 6 for supporting the cutter disc is installed on the bottom surface of the box body 1 and below the water spray flange 7. The bottom bracket 6 is placed in the tunnel to support the cutter disc.

[0041] When the present invention is in use, the pressing frame 34 pulls the dustproof cloth 26 upward until the upper surface of the fixed frame plate 19 is in contact with the top surface of the inner cavity of the tunnel, forming a sealed dustproof space, improving the working environment of the tunnel, avoiding affecting the operations of other types of work in the tunnel, and the dust generated by hole expansion is not easy to spread in the tunnel. In conjunction with the dust reduction component, the dust generated during hole expansion is reduced; the slag generated during hole expansion falls into the feed trolley 22 under the action of gravity and is collected in a centralized manner. When the feed trolley 22 is full of slag, it is discharged to the hole opening along the track 21, which will not cause the tunnel to be blocked, and has high safety.

[0042] Initially, the top of the ejector pin 30 enters the corresponding water seepage step ring hole, and the slag produced by the hole expansion falls to the upper surface of the supporting transparent plate 25 and is blocked by the ejector pin 30 to prevent the slag from passing through the water seepage step ring hole and entering the water seepage cavity. After the upper surface of the supporting transparent plate 25 is covered with slag, the ejector pin 30 leaves the corresponding water seepage step ring hole, increasing the flow rate of water seepage, and the slag sprayed by the dust suppression component penetrates into the water seepage cavity through the water seepage step ring hole, realizing the solid-liquid separation of the slag;

[0043] After the feeding trolley 22 is full of slag, it reaches the hole entrance via the track 1 21. Another feeding trolley 22 changes track through the track change tool 36 at the turnout, and the feeding trolley 22 reaches the end of the track 1 21, that is, just below the guide hole, to realize the relay collection of slag.

[0044] By setting up a fan-shaped water mist spray unit and a circumferential side water mist spray unit, high-pressure water flow enters the dust removal distribution pipe 5 and the water spray pipe 15, and sprays high-pressure water mist to the circumferential side outer wall of the cutter disc through nozzle 2, and nozzle 16 sprays fan-shaped high-pressure water mist in different directions at the bottom of the cutter disc to wet the dust and prevent the dust from spreading to the surroundings. The coverage area is large and the dust removal effect is good.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A wet dust suppression system for hole enlargement cutterheads, comprising a cutterhead disposed at the top of a tunnel directly below a guide hole, characterized in that: A pull rod (3) with a hollow structure is provided in the middle of the top surface of the cutter disc, and a dust suppression component is installed on the bottom surface of the cutter disc, a drill rod (20) for inputting pressurized water is installed on the top of the pull rod (3), and a track one (21) and a track two (35) are installed on the bottom surface of the inner cavity of the tunnel, the ends of the track one (21) and the track two (35) are close to the hole, and a feed trolley (22) for collecting debris is rotatably installed on the track one (21) and the track two (35), and a telescopic dust prevention component for contacting the feed trolley (22) with the top surface of the inner cavity of the tunnel is provided on the top of the feed trolley (22); The telescopic dustproof component comprises a fixed frame plate (19) arranged on the top outer wall surface of the feeding trolley (22), a dustproof cloth (26) is arranged on the upper surface of the fixed frame plate (19), a pressing frame (34) is fixedly connected to the top end of the dustproof cloth (26), and the pressing frame (34) is located outside the cutter disc; The inner cavity of the material conveying trolley (22) is provided with a supporting transparent plate (25) for slag accumulation, and the inner cavity of the material conveying trolley (22) and located below the supporting transparent plate (25) is a water seepage cavity, and the surface of the supporting transparent plate (25) is penetrated by a plurality of water seepage step ring holes, and the water seepage step ring holes include a first through hole (27) and a second through hole (28), and the first through hole (27) is located above the second through hole (28) and is connected to the second through hole (28); A waterproof electric push rod (24) is installed on the bottom surface of the inner cavity of the feed trolley (22), a push plate (29) is installed on the pushing end of the electric push rod (24), and a plurality of ejector pins (30) for use with corresponding water seepage step ring holes are arranged on the upper surface of the push plate (29); A baffle (23) is provided at the end of the track 1 (21) to limit and block the feed trolley (22); a drainage port communicating with the water seepage cavity is provided on one side outer wall of the feed trolley (22); and a support seat is provided below the feed trolley (22), the support seat being rotatably connected to the feed trolley (22).

2. A wet dust reduction system for a hole enlarging cutter disc according to claim 1, characterized in that: A fixing block (31) is provided on the top outer wall of the feeding trolley (22) and below the fixing frame plate (19). A travel cylinder (33) is mounted on the surface of the fixing block (31). The pushing end of the travel cylinder (33) is fixed to the bottom surface of the pressing frame (34).

3. A wet dust reduction system for a hole enlarging cutter disc according to claim 1, characterized in that: A track-changing tool (36) for changing the track is installed at the switch of the track 2 (35) close to the track 1 (21).

4. A wet dust reduction system for a hole enlarging cutter disc according to claim 1, characterized in that: The cutter disc comprises a box body (1) with a mounting hole body, four blade wings (2) are mounted on the outside of the box body (1) and are fitted together, a roller (4) is arranged on the upper surface of the blade wings (2) and the box body (1), an entry groove (8) is arranged on the lower surface of the box body (1), and a through groove (9) and a discharge groove (10) are arranged on the outer surface of the blade wings (2) in sequence.

5. The wet dust reduction system for hole enlarging cutter disc according to claim 1, characterized in that: The dust suppression component comprises a water spray flange (7) arranged in the middle of the bottom surface of the box body (1), the water spray flange (7) is connected to the box body (1) and the pull rod (3), and fan-shaped water mist spray units operating on the bottom of the cutter disc are symmetrically installed on both sides of the water spray flange (7), and the fan-shaped water mist spray unit comprises a dust removal distribution pipe (5) with a fan-shaped structure and a water outlet pipe (17) arranged on both sides of the water spray flange (7), and both ends of the water outlet pipe (17) are installed with a rubber hose three (18) connected to the inner side surface of the dust removal distribution pipe (5), and the bottom surface and side surface of the dust removal distribution pipe (5) are installed with nozzle two.

6. A wet dust suppression system for hole enlarging cutter disc according to claim 5, characterized in that: The other two sides of the water spray flange (7) are symmetrically provided with circumferential side water mist spray units for operating on the periphery of the cutter disc. The circumferential side water mist spray units include a rubber hose (12) connected to the water spray flange (7). The end of the rubber hose (12) is fixedly connected to a transfer tube (13) passing through the inside of the entry groove (8). The end of the transfer tube (13) is provided with a rubber hose (14). The end of the rubber hose (14) is fixedly connected to a water spray pipe (15) passing through the inside of the through groove (9). The end of the water spray pipe (15) is fixedly connected to a nozzle (16) passing through the inside of the discharge groove (10) and facing the outside of the circumferential side of the cutter disc. The connection between the dust removal distribution pipe (5), the rubber hose (12), the transfer tube (13) and the cutter disc is equipped with a buckle seat (11).

7. A wet dust suppression system for a hole enlarging cutter disc according to claim 5, characterized in that: A bottom bracket (6) for supporting the cutter disc is installed on the bottom surface of the box body (1) and below the water spray flange (7).

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