Environment-friendly dust removal device for tunnel construction

Abstract

This application relates to the technical field of tunnel construction equipment, improving the problem of uneven spray range of high-pressure nozzles. It discloses an environmentally friendly dust removal device for tunnel construction, including a box truck and a water storage tank and booster pump installed inside the box truck. The box truck is equipped with a nozzle, a support mechanism, and a drive mechanism. A water pipe connects the nozzle to the booster pump. The support mechanism includes a rotating component rotatably connected to the box truck in the horizontal direction and a bracket fixed to the rotating component. The nozzle is rotatably connected to the bracket in the vertical direction. The drive mechanism includes a driving wheel and a drive assembly that drives the driving wheel to rotate vertically. Driven wheels mesh with opposite sides of the driving wheel. A connecting column is eccentrically arranged on the driven wheel. A drive rack is hinged between the two connecting columns and meshes with the rotating component. A pushing part protrudes from the rack and abuts against the nozzle. The nozzle can swing in all directions in both horizontal and vertical directions, achieving automatic, uniform, and rapid dust removal.

Description

Technical Field

[0001] This application relates to the technical field of tunnel construction equipment, and in particular to an environmentally friendly dust removal device for tunnel construction. Background Technology

[0002] Dust pollution is common at construction sites, especially during tunnel construction involving drilling and blasting, which generates large amounts of dust that permeates the tunnel and is difficult to disperse, seriously threatening the health of workers inside the tunnel.

[0003] Existing tunnel dust removal devices include a mobile van and a high-pressure nozzle mounted on the van. The van contains a water tank and a booster pump. The water tank is connected to a water pipe. Water enters the high-pressure nozzle through the booster pump and is sprayed out as a mist, thereby adsorbing and settling the dust.

[0004] However, the spray direction of the high-pressure nozzles in the current tunnel dust removal device still needs to be controlled by the operator, which results in an uneven spray range. Moreover, the rotation direction is singular, and it is necessary to control it by rotating the box car at the same time to achieve a larger spray range. This is very inconvenient to operate, has low dust removal efficiency, and operators are still very likely to inhale dust. Summary of the Invention

[0005] To improve the uneven spray range of high-pressure nozzles, this application provides an environmentally friendly dust removal device for tunnel construction.

[0006] This application provides an environmentally friendly dust removal device for tunnel construction, which adopts the following technical solution: An environmentally friendly dust removal device for tunnel construction includes a box truck and a water storage tank and a booster pump installed inside the box truck. The box truck is equipped with a nozzle, a support mechanism, and a drive mechanism. A water pipe connects the nozzle to the booster pump. The support mechanism includes a rotating component rotatably connected to the box truck in the horizontal direction and a bracket fixed to the rotating component. The nozzle is rotatably connected to the bracket in the vertical direction. The drive mechanism includes a driving wheel and a drive assembly that drives the driving wheel to rotate vertically. Driven wheels mesh with opposite sides of the driving wheel. A connecting column is eccentrically arranged on each driven wheel. A drive rack is hinged between the two connecting columns and meshes with the rotating component. A pushing part protrudes from the rack and abuts against the nozzle.

[0007] By adopting the above technical solution, after the drive component drives the active wheel to rotate, the active wheel drives the two driven wheels on both sides to rotate in the same direction, thereby causing the drive rack to make elliptical motion. The connecting column meshing with the drive rack rotates, thereby driving the nozzle to reciprocate in the horizontal direction. On the other hand, the push part on the drive rack also makes elliptical motion with the drive rack. That is, the push part can resist the nozzle to rotate up and down, thereby making the spray end of the nozzle swing in all directions in the horizontal and vertical directions, improving the spray range and achieving uniform and rapid dust removal. Moreover, no operator is required, reducing the impact on people's health.

[0008] Optionally, the drive assembly includes a drive member with a rotation output end and a first drive wheel and a second drive wheel coaxially connected to the output end of the drive member. The first drive wheel has a half-circle internal tooth, and the second drive wheel has a half-circle external tooth. The drive wheel is internally engaged with the first drive wheel and externally engaged with the second drive wheel. The drive wheel alternately engages with the internal tooth and the external tooth.

[0009] By adopting the above technical solution, a driving component simultaneously drives the first driving wheel and the second driving wheel to rotate. The driving wheel is connected between the first driving wheel and the second driving wheel and meshes alternately in sequence. That is, the half-turns of the internal and external teeth are arranged opposite to each other. When the driving wheel meshes with the internal teeth of the first driving wheel, the driving wheel and the first driving wheel rotate in the same direction. When the driving wheel meshes with the external teeth of the second driving wheel, the driving wheel and the second driving wheel rotate in opposite directions. Therefore, the driving wheel can reciprocate in both forward and reverse directions, thereby driving the rack to continuously change direction and make elliptical motion through the driven wheel. This allows the nozzle to be driven by the pusher to spray upward and downward at different directions, thereby making the spray range more uniform and further improving the uniform dust removal effect.

[0010] Optionally, the sidewall of the nozzle is rotatably connected to the bracket, and the nozzle has a spray end and a counterweight end located on both sides of the bracket, with a counterweight installed in the counterweight end.

[0011] By adopting the above technical solution, a heavy counterweight is provided at the end of the nozzle furthest from the spray end. This allows the counterweight at the tail of the nozzle to drop downwards under the influence of gravity when the pusher moves to the lowest position with the drive rack. At this time, the spray end is spraying upwards, thus enabling the spray end to rotate stably upwards and downwards, ensuring a larger spray range. Moreover, the counterweight prevents the nozzle from automatically falling downwards when the spray end is facing downwards after being pushed across the horizontal direction by the pusher, further improving the uniformity of the spray.

[0012] Optionally, the pushing part is always in contact with the bottom of the counterweight end.

[0013] By adopting the above technical solution, the pusher can always abut against the nozzle, ensuring that the nozzle can move at a uniform speed with the drive rack, and will not detach from the pusher, causing the counterweight end to fall downwards at an accelerated speed, or the spray end to spray upwards at an accelerated speed, thus further ensuring the uniformity of the spray.

[0014] Optionally, a first guide frame is provided on the drive rack at the end away from the rotating member. A first guide hole is vertically opened on the first guide frame. A squeezing member is provided at the top of the first guide hole. The water pipe extends from the counterweight end, passes through the first guide hole, and is connected to the booster pump in the box truck. When the water pipe moves downward with the counterweight end in the first guide hole, the squeezing member can squeeze the water pipe.

[0015] By adopting the above technical solution, the first guide hole can limit the water pipe from swinging wildly with the oscillating nozzle, thus playing a certain limiting role. When the push part moves to the lowest point with the drive rack, the counterweight end also rotates downward, and the water pipe also moves downward in the first guide hole with the counterweight end. At this time, the spray end sprays upward, and the mist falls downward in a parabolic trajectory, thereby reducing the spray distance. At this time, the water pressure can be increased by squeezing the water pipe through the squeezing component, thereby increasing the spray distance. This ensures that the farthest spray position remains as consistent as possible during the omnidirectional rotation of the spray end, further improving the uniformity of spray dust removal and increasing dust removal efficiency.

[0016] Optionally, the extrusion component includes an extrusion block slidably connected in the first guide hole, an elastic element that drives the extrusion block to slide upward, and a mating block disposed in the first guide hole above the extrusion block. The number of mating blocks is two, and they are symmetrically disposed on the two vertical inner walls of the first guide hole along the vertical center plane. The water pipe is extruded downward through the two mating blocks and then subjected to the extrusion block.

[0017] By adopting the above technical solution, the extrusion component is specifically configured to have two mating blocks and one extrusion block to extrude the water pipe. The distance between the two mating blocks is slightly smaller than the diameter of the water pipe. When the water pipe moves downward with the counterweight end, it will pass through the two mating blocks. Then, the lower end of the water pipe will be extruded upward by the extrusion block driven by the elastic element. At this time, the water pipe still has a downward tendency with the counterweight end, and the upper end of the water pipe is not easily pushed upward by the extrusion block due to the abutment of the mating blocks. This causes the water pipe to be extruded and deformed, thereby increasing the water flow velocity inside the water pipe. This allows for a longer spray distance even when the spray head is pointing upward.

[0018] Optionally, the side of the mating block away from the extrusion block is configured as a guide surface, the two guide surfaces are inclined downwards in a direction that brings them closer to each other, and the side of the mating block facing the extrusion block is configured as a horizontal limiting surface.

[0019] By adopting the above technical solution, the top surface of the mating block is set as an inclined guide surface, which makes it easier for the water pipe to pass downwards, while the bottom surface of the mating block is set as a plane, making it more difficult for the water pipe to pass upwards when squeezed by the squeezing block. This makes it easier for the water pipe to be squeezed to increase its size, and further improves the stability of the uniform spray from the nozzle.

[0020] Optionally, the inner wall of the first guide hole is covered with a flexible cushioning pad.

[0021] By adopting the above technical solution, since the water pipe is guided by the first guide frame and will continuously rub against the inner wall of the first guide hole, the possibility of water pipe wear can be reduced by the flexible and deformable buffer pad, ensuring the normal use of the entire environmental protection dust removal equipment.

[0022] Optionally, a second guide frame is fixed on the side of the drive rack away from the rotating component on the box truck. The second guide frame has a second guide hole in the horizontal direction. The water pipe extends from the counterweight end and passes through the first guide hole and the second guide hole in sequence before entering the box truck.

[0023] By adopting the above technical solution, the first guide frame can restrict the water pipe from swinging arbitrarily in the vertical direction, the second guide frame moves together with the drive rack, and a fixed second guide frame is set on the box truck to restrict the water pipe from swinging in the horizontal direction, ensuring the stability of water pressure and thus ensuring the uniformity of spraying.

[0024] Optionally, the second guide frame includes a first baffle and a second baffle spaced apart along a direction away from the rack. The first baffle is close to the rack, and the second guide hole is opened on the first baffle. Two side plates are respectively connected between the opposite vertical edges of the first baffle and the second baffle to form a limiting channel for the water pipe to enter the box truck downwards.

[0025] By adopting the above technical solution, the second guide plate is specifically formed by the first baffle, the second baffle and two side plates to form a limiting channel. The water pipe after passing through the first guide hole and the second guide hole enters the box truck through the limiting channel, thereby further reducing the possibility of the water pipe swinging and twisting at will, and thus ensuring the stability of the spray.

[0026] In summary, this application includes at least one of the following beneficial effects: 1. The drive assembly drives the drive wheel to rotate in a reversing direction. The drive wheel drives the two driven wheels on both sides to rotate in the same direction, which in turn causes the drive rack to perform a reversing elliptical motion. The connecting column meshing with the drive rack rotates back and forth, thereby driving the nozzle to rotate back and forth in the horizontal direction. At the same time, the push part on the drive rack can resist the nozzle to rotate up and down, so that the spray end of the nozzle can swing in all directions in the horizontal and vertical directions, which improves the spray range, achieves uniform and rapid dust removal, and requires no operator intervention, reducing the impact on people's health. 2. The water pipe is restricted by the first and second guide frames and will not swing arbitrarily to ensure the stability of the spray state. When the nozzle is spraying upwards, the water pipe will be squeezed to increase the spray distance, further improving the uniformity of the spray and improving the dust removal efficiency and effect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the environmental protection dust removal device for tunnel construction in the embodiments of this application; Figure 2 This is a schematic diagram of the drive assembly, driving wheel, and driven wheel in an embodiment of this application; Figure 3 This is a schematic diagram of the nozzle in a horizontal spray state in an embodiment of this application; Figure 4 This is a schematic diagram of the nozzle in a downward spraying state in an embodiment of this application; Figure 5 This is a cross-sectional view of the first guide frame in the embodiments of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Box truck; 2. Nozzle; 21. Spraying end; 22. Counterweight end; 23. Counterweight component; 3. Support mechanism; 31. Rotating component; 32. Bracket; 33. Support base; 4. Drive mechanism; 41. Drive assembly; 411. Drive component; 412. First drive wheel; 4121. Internal gear; 413. Second drive wheel; 4131. External gear; 42. Driving wheel; 43. Driven wheel; 44. Connecting column; 45. 451. Drive rack; 46. Pushing part; 47. First guide frame; 48. First guide hole; 49. Limiting groove; 40. Buffer pad; 41. Extrusion component; 42. Extrusion block; 43. Elastic element; 44. Mating block; 45. Guide surface; 46. Limiting surface; 47. Second guide frame; 48. Second guide hole; 49. First baffle; 40. Second baffle; 41. Side plate; 42. Water pipe. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0030] Reference Figure 1This application discloses an environmentally friendly dust removal device for tunnel construction, including a box truck 1 and a water storage tank and a booster pump installed inside the box truck 1; the box truck 1 is equipped with a nozzle 2, a support mechanism 3 and a drive mechanism 4, and a water pipe 5 is connected between the nozzle 2 and the booster pump. The support mechanism 3 and the drive mechanism 4 can cooperate to drive the nozzle 2 to swing in all directions in the horizontal and vertical directions, which improves the spray range and achieves uniform and rapid dust removal; moreover, no operator is required, which reduces the impact on people's health.

[0031] The bottom of the box truck 1 is equipped with omnidirectional casters. The box truck 1 can be pushed by a water truck. The water tank of the water truck is connected to the water storage tank, so it can provide a large amount of water. The staff only need to control the water truck from the cab of the water truck, which reduces the possibility of absorbing dust.

[0032] Specifically, refer to Figure 1 The booster pump is connected to the water storage tank. The top of the vehicle 1 has a through hole for the water pipe 5 connected from the outlet of the booster pump to the nozzle 2. The support mechanism 3 includes a rotating part 31 rotatably connected to the vehicle 1 in the horizontal direction and a bracket 32 ​​fixed to the rotating part 31. The nozzle 2 is rotatably connected to the bracket 32 ​​in the vertical direction. A support base 33 is fixed to the top of the vehicle 1 near the forward direction. A vertical rotating shaft is provided on the support base 33. The rotating part 31 is sleeved on the rotating shaft, and a bearing is connected between the rotating part 31 and the rotating shaft to improve the smoothness of rotation. The bracket 32 ​​has two opposing vertical rods, and the side wall of the nozzle 2 is hinged between the two vertical rods.

[0033] The nozzle 2 includes a spray end 21 and a counterweight end 22 located on both sides of the connection point of the bracket 32. The water pipe 5 enters from the counterweight end 22 and is connected to the nozzle 2. The spray end 21 has nozzles arranged in an array along the circumference of the nozzle 2. The counterweight end 22 is equipped with a counterweight 23, which can be a concrete block or a metal block with a high density.

[0034] Reference Figure 2 The drive mechanism 4 includes a drive wheel 42 and a drive assembly 41 that drives the drive wheel 42 to rotate vertically. Driven wheels 43 mesh with each other on opposite sides of the drive wheel 42. A connecting post 44 is eccentrically mounted on each driven wheel 43. A drive rack 45 is hinged between the two connecting posts 44. The drive rack 45 has a connecting hole along its length on the side facing the driven wheel 43 for the connecting post 44 to be inserted. A bearing is fitted onto the end of the connecting post 44 that inserts into the connecting hole. The surface of the rotating component 31 has teeth arranged circumferentially. The drive rack 45 meshes with the rotating component 31. A pushing part 451 protrudes from the rack and abuts against the nozzle 2. The top surface of the pushing part 451 is arc-shaped. (Refer to...) Figure 3 and Figure 4After the drive assembly 41 drives the drive wheel 42 to rotate, the drive wheel 42 drives the two driven wheels 43 on both sides to rotate in the same direction, which in turn causes the drive rack 45 to make elliptical motion. The connecting column 44 meshing with the drive rack 45 rotates, thereby driving the nozzle 2 to reciprocate in the horizontal direction. On the other hand, the push part 451 on the drive rack 45 abuts against the nozzle 2 and rotates up and down, thereby causing the spray end 21 to swing in all directions in the horizontal and vertical directions, which improves the spray range and achieves uniform and rapid dust removal.

[0035] Furthermore, the pusher 451 is always abutting below the counterweight end 22. That is, the height of the pusher 451 and the rotation angle of the nozzle 2 are matched so that when the pusher 451 moves to the lowest point with the drive rack 45, the counterweight end 22 of the nozzle 2 also abuts against the pusher 451. This ensures that the nozzle 2 can move at a uniform speed with the drive rack 45, and will not detach from the pusher 451, causing the counterweight end 22 to accelerate downward, i.e., the spray end 21 to accelerate upward. Moreover, the counterweight 23 ensures that the nozzle 2 will not automatically fall when the spray end 21 is downward after being pushed across the horizontal direction by the pusher 451, further improving the uniformity of the spray.

[0036] In other embodiments, the drive assembly 41 may be configured as a single motor or drive the drive wheel 42 to rotate about the central axis via a motor and a gear chain.

[0037] In this embodiment, to further improve the uniform dust removal effect, the drive assembly 41 includes a drive member 411 with a rotating output end and a first drive wheel 412 and a second drive wheel 413 coaxially connected to the output end of the drive member 411. The drive member 411 is preferably a motor fixed to the top of the vehicle 1 at the end away from the forward direction. The first drive wheel 412 has a half-circle internal tooth 4121, and the second drive wheel 413 has a half-circle external tooth 4131. The drive wheel 42 is internally engaged with the first drive wheel 412 and externally engaged with the second drive wheel 413. The drive wheel 42 alternately engages with the internal tooth 4121 and the external tooth 4131. That is, the inner teeth 4121 and the outer teeth 4131 are set opposite to each other; when the driving wheel 42 is internally engaged with the inner teeth 4121 of the first driving wheel 412, the driving wheel 42 and the first driving wheel 412 rotate in the same direction; when the driving wheel 42 is externally engaged with the outer teeth 4131 of the second driving wheel 413, the driving wheel 42 and the second driving wheel 413 rotate in opposite directions. Therefore, the driving wheel 42 can reciprocate in both forward and reverse directions, thereby driving the rack 45 to continuously change direction and make elliptical motion through the driven wheel 43, so that the nozzle 2 can be driven by the push part 451 to spray upward and downward when rotating in different directions, thereby making the spray range more uniform.

[0038] Furthermore, refer to Figure 1A vertical first guide frame 46 is provided on the side of the drive rack 45 away from the rotating part 31. A first guide hole 461 is provided on the first guide frame 46 along the vertical direction. The first guide hole 461 can limit the water pipe 5 from swinging wildly with the swinging nozzle 2 and play a certain limiting role.

[0039] Moreover, refer to Figure 5 The first guide frame 46 has a pressing component 47 installed at the top inside the first guide hole 461. The water pipe 5 extends from the counterweight end 22, passes through the first guide hole 461, and is connected to the booster pump inside the box truck 1. The pressing component 47 includes a pressing block 471 slidably connected inside the first guide hole 461, an elastic member 472 that drives the pressing block 471 to slide upward, and a mating block 473 located above the pressing block 471 inside the first guide hole 461. Limiting grooves 462 are formed on the two opposite vertical inner walls of the first guide hole 461, and sliding parts that slide within the limiting grooves 462 are provided on both sides of the pressing block 471. The elastic member 472 can be a spring or a rubber pad. One end of the elastic member 472 is connected to the bottom wall of the first guide hole 461, and the other end is connected to the pressing block 471. The number of mating blocks 473 is as follows: Two mating blocks 473 are symmetrically arranged on the two vertical inner walls of the first guide hole 461 along the vertical center face of the first guide hole 461. The distance between the two mating blocks 473 is slightly smaller than the diameter of the water pipe 5. The mating blocks 473 can also limit the range of upward movement of the extrusion block 471 driven by the elastic element 472. The side of the mating block 473 away from the extrusion block 471 is set as a guide surface 4731. The two guide surfaces 4731 are inclined downward in the direction of mutual approach, and the guide surfaces 4731 are preferably arc-shaped to reduce the possibility of wear on the water pipe 5. The side of the mating block 473 facing the extrusion block 471 is set as a horizontal limiting surface 4732.

[0040] When the pusher 451 moves to its lowest point along with the drive rack 45, the counterweight 22 also rotates downwards, and the water pipe 5 moves downwards within the first guide hole 461 along with the counterweight 22. At this time, the spray end 21 sprays upwards, and the mist falls in a parabolic trajectory, thus reducing the spray distance. As the water pipe 5 continues to move downwards with the counterweight 22, it passes through two mating blocks 473. Then, the lower end of the water pipe 5 is squeezed upwards by the compression block 471 driven by the elastic element 472. At this time, the water pipe 5 still tends to move downwards with the counterweight 22, and the upper end of the water pipe 5 is not easily pushed upwards by the compression block 471 due to the abutment of the limiting surface 4732 of the mating block 473. This causes the water pipe 5 to be squeezed and deformed, thereby increasing the water flow velocity inside the water pipe 5. This allows the spray end 21 to achieve a longer spray distance even when spraying upwards, ensuring that the furthest spray position remains consistent during the omnidirectional rotation of the spray end 21, further improving the uniformity of spray dust removal and increasing dust removal efficiency.

[0041] Optionally, but not limited to, the inner wall of the first guide hole 461 is covered with a flexible buffer pad 463. The buffer pad 463 can be a rubber pad or a sponge pad, preferably a non-absorbent rubber pad. Because the water pipe 5 is guided by the first guide frame 46 and will continuously rub against the inner wall of the first guide hole 461, the flexible and deformable buffer pad 463 can reduce the possibility of wear on the water pipe 5 and ensure the normal use of the entire environmental dust removal equipment.

[0042] The first guide frame 46 can restrict the water pipe 5 from swinging freely in the vertical direction. In order to further restrict the water pipe 5 from swinging freely in the horizontal plane after extending out of the first guide frame 46, a second guide frame 48 is also fixed on the side of the drive rack 45 away from the rotating part 31 on the box car 1. The second guide frame 48 includes a first baffle 482 and a second baffle 483 arranged at intervals in the direction away from the rack. The first baffle 482 is close to the rack. A second guide hole 481 is opened on the first baffle 482 in the horizontal direction. Two side plates 484 are respectively connected between the relative vertical edges of the first baffle 482 and the second baffle 483 to form a limiting channel for the water pipe 5 to enter the box car 1 downwards. The water pipe 5 on the second guide frame 48 extends out from the counterweight end 22 and passes through the first guide hole 461 and the second guide hole 481 in sequence before entering the box car 1 through the limiting channel. In order to accommodate the water pipe 5 moving up and down, the width of the second guide hole 481 is set to one-third to two-thirds of the length of the first guide hole 461. The second guide frame 48 is fixed to limit the possibility of the water pipe 5 swinging and twisting arbitrarily in the horizontal direction, so as to ensure the stability of water pressure and thus ensure the uniformity of spray.

[0043] It should be noted that the rotation shafts of the first drive wheel 412 and the second drive wheel 413, as well as the rotation shaft of the drive wheel 42, can all be rotatably connected to the second baffle 483 to provide support.

[0044] The implementation principle of an environmentally friendly dust removal device for tunnel construction according to an embodiment of this application is as follows: The drive component 411 drives the drive wheel 42 to rotate in a different direction via the first drive wheel 412 and the second drive wheel 413. The drive wheel 42 drives the two driven wheels 43 on both sides to rotate in the same direction, which in turn causes the drive rack 45, which is eccentrically connected to the drive wheel 42, to make an elliptical motion. The connecting column 44, which meshes with the drive rack 45, rotates back and forth, thereby causing the nozzle 2 to swing back and forth in the horizontal direction. On the other hand, the push part 451 on the drive rack 45 also makes an elliptical motion with the drive rack 45. That is, the push part 451 can abut against the nozzle 2 and make a rotational up and down motion, thereby causing the spray end 21 to swing in all directions in the horizontal and vertical directions, which improves the spray range. Moreover, when the spray end 21 sprays upward, the water pipe 5 will also be squeezed by the squeezing component 47 to increase the spray distance, thus achieving uniform and rapid dust removal.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An environmentally friendly dust removal device for tunnel construction, comprising a box truck (1) and a water storage tank and a booster pump disposed within the box truck (1), characterized in that: The van (1) is equipped with a nozzle (2), a support mechanism (3), and a drive mechanism (4); a water pipe (5) is connected between the nozzle (2) and the booster pump; the support mechanism (3) includes a rotating part (31) rotatably connected to the van (1) in the horizontal direction and a bracket (32) fixed to the rotating part (31); the nozzle (2) is rotatably connected to the bracket (32) in the vertical direction; the drive mechanism (4) includes a drive wheel (42) and a drive assembly (41) that drives the drive wheel (42) to rotate vertically; driven wheels (43) mesh on opposite sides of the drive wheel (42). A connecting post (44) is eccentrically provided on the driven wheel (43), and a driving rack (45) is hinged between the two connecting posts (44). The driving rack (45) meshes with the rotating part (31). A pushing part (451) protrudes from the rack and abuts against the nozzle (2). The side wall of the nozzle (2) is rotatably connected to the bracket (32). The nozzle (2) has a spray end (21) and a counterweight end (22) located on both sides of the bracket (32). A counterweight (23) is installed in the counterweight end (22). The pushing part (451) always abuts against the bottom of the counterweight end (22). The drive rack (45) has a first guide frame (46) at one end away from the rotating member (31). The first guide frame (46) has a first guide hole (461) vertically opened on the first guide frame (46). The first guide frame (46) has a pressing member (47) at the top inside the first guide hole (461). The water pipe (5) extends from the counterweight end (22) and passes through the first guide hole (461) before being connected to the booster pump inside the box truck (1). When the water pipe (5) moves downward in the first guide hole (461) along with the counterweight end (22), the pressing member (47) can press... The water pipe (5); the extrusion component (47) includes an extrusion block (471) slidably connected in the first guide hole (461), an elastic element (472) that drives the extrusion block (471) to slide upward, and a mating block (473) disposed in the first guide hole (461) above the extrusion block (471). There are two mating blocks (473) and they are symmetrically disposed on the two vertical inner walls of the first guide hole (461) along the vertical center face. The water pipe (5) is extruded downward through the two mating blocks (473) and then extruded by the extrusion block (471).

2. The environmentally friendly dust removal device for tunnel construction according to claim 1, characterized in that: The drive assembly (41) includes a drive member (411) with a rotation output end and a first drive wheel (412) and a second drive wheel (413) coaxially connected to the output end of the drive member (411). The first drive wheel (412) has a half-circle internal tooth (4121), and the second drive wheel (413) has a half-circle external tooth (4131). The drive wheel (42) is internally engaged with the first drive wheel (412) and externally engaged with the second drive wheel (413). The drive wheel (42) alternately engages with the internal tooth (4121) and the external tooth (4131).

3. The environmentally friendly dust removal device for tunnel construction according to claim 1, characterized in that: The side of the mating block (473) away from the extrusion block (471) is set as a guide surface (4731), and the two guide surfaces (4731) are inclined downward in the direction of mutual approach. The side of the mating block (473) facing the extrusion block (471) is set as a horizontal limiting surface (4732).

4. The environmentally friendly dust removal device for tunnel construction according to claim 1, characterized in that: The inner wall of the first guide hole (461) is covered with a flexible buffer pad (463).

5. The environmentally friendly dust removal device for tunnel construction according to claim 1, characterized in that: A second guide frame (48) is fixed on the side of the drive rack (45) away from the rotating member (31) of the box car (1). A second guide hole (481) is opened on the second guide frame (48) in the horizontal direction. The water pipe (5) extends out from the counterweight end (22) and passes through the first guide hole (461) and the second guide hole (481) in sequence before entering the box car (1).

6. The environmentally friendly dust removal device for tunnel construction according to claim 5, characterized in that: The second guide frame (48) includes a first baffle (482) and a second baffle (483) spaced apart along the direction away from the rack. The first baffle (482) is close to the rack. The second guide hole (481) is opened on the first baffle (482). Two side plates (484) are respectively connected between the relative vertical edges of the first baffle (482) and the second baffle (483) to form a limiting channel for the water pipe (5) to enter the box truck (1) downwards.

Images