Ventilation and dust removal equipment for tunnel construction

Abstract

The present application relates to the technical field of tunnel construction equipment, and in particular to a ventilation and dust removal device for tunnel construction, comprising two fan bodies, the two fan bodies are connected through an air duct, a dust removal mechanism is provided on the air duct, and the dust removal mechanism is used to remove dust in the air passing through the air duct; a silencer mechanism is connected to the air inlet end of the fan body. The present application has the effect of improving the construction environment.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel construction equipment, and in particular to a ventilation and dust removal device for tunnel construction. Background Art

[0002] During the tunnel construction process, one end of the tunnel construction is a closed end. During activities such as drilling, blasting and mechanical operations, a large amount of dust is generated. In the tunnel, air is difficult to circulate, causing the dust to gather in the tunnel. This dust not only poses a threat to the health of construction workers, but also seriously affects construction efficiency and project quality.

[0003] In the prior art, during tunnel construction, a fan is installed in the tunnel, with the air inlet of the fan facing the tunnel and the air outlet facing the tunnel entrance. When the fan is started, the air in the tunnel is sucked in from the air inlet of the fan and discharged from the air outlet of the fan, so that the air in the tunnel circulates and air circulation is achieved. However, as the tunnel is constructed, the tunnel depth increases and the dust increases. The air circulation range under the action of the fan is limited, which can easily cause the gas exhausted from the fan to enter the tunnel again, causing the dust contained in the exhaust gas from the fan to circulate with the gas, causing the dust in the tunnel to fly. In addition, during the operation of the fan, noise is easily generated, and the tunnel construction environment is poor, which affects the construction efficiency of the construction personnel. Utility Model Content

[0004] In order to improve the construction environment, the present application provides a ventilation and dust removal device for tunnel construction.

[0005] The ventilation and dust removal device for tunnel construction provided in this application adopts the following technical solution:

[0006] A ventilation and dust removal device for tunnel construction comprises two fan bodies, which are connected via an air duct. A dust removal mechanism is provided on the air duct to remove dust from the air passing through the air duct. A silencer mechanism is connected to the air inlet end of the fan body.

[0007] By adopting the above technical scheme, two fan bodies are respectively installed in the tunnel and at the tunnel entrance, forming effective air convection, improving the ventilation efficiency in the tunnel, and quickly updating the air in the tunnel; a dust removal mechanism is set on the air duct to make the air circulate in the dust removal mechanism, and the dust removal mechanism removes dust in the air passing through the air duct, purifies the gas, reduces the possibility of dust-rich gas discharged from the fan body, reduces the particulate matter contained in the gas discharged from the fan body, and improves the air quality around the tunnel entrance. When the air around the tunnel entrance re-enters the tunnel under the suction action of the fan body inside the tunnel, the particulate matter in the air is reduced, the air purification effect in the tunnel is improved, and it is convenient for construction personnel to carry out construction in the tunnel; by setting a silencer mechanism, the noise generated during the operation of the fan body is reduced, the impact of noise on construction personnel is reduced, and the construction environment is improved.

[0008] Optionally, the air duct includes a first branch pipe and a second branch pipe, the first branch pipe is connected to the dust removal mechanism, the dust removal mechanism is connected to the second branch pipe, the first branch pipe and the second branch pipe are connected to the two fan bodies at one end away from the dust removal mechanism, and the dust removal mechanism is detachably connected to the first branch pipe and the second branch pipe.

[0009] By adopting the above technical solution, when the dust removal mechanism is rich in dust, the dust removal mechanism can be removed from the first branch pipe and the second branch pipe, which is convenient for cleaning or maintenance of the dust removal mechanism, reducing the possibility of dust accumulation in the dust removal mechanism leading to a decrease in dust removal effect, and improving the air purification effect.

[0010] Optionally, the dust removal mechanism includes a shell, a dust filter and a dust collecting box, the air inlet end of the shell is connected to the first branch pipe, the air outlet end of the shell is connected to the second branch pipe, the outer wall of the dust filter is connected to the inner wall of the shell, the dust filter is used to intercept dust in the air, the dust collecting box is connected to the shell and is located at the bottom of the dust filter, and the dust collecting box is used to collect intercepted dust.

[0011] By adopting the above technical solution, the gas flows along the air duct under the action of the fan body, and the gas carrying dust passes through the dust filter. The dust filter intercepts the dust and falls into the dust collecting box at the bottom. The dust is collected and processed, reducing the possibility of dust accumulating at the bottom of the dust filter and clogging the dust filter.

[0012] Optionally, the dust removal mechanism further includes a spray assembly and a drying assembly, and the dust removal filter, the spray assembly and the drying assembly are fixed to the inner wall of the shell in sequence along the direction from the air inlet end to the air outlet end of the air duct.

[0013] By adopting the above technical solution, after the gas passes through the dust removal filter to intercept dust, the gas still contains fine dust particles that can pass through the dust removal filter. The dust removal effect of the dust removal filter on the gas is limited. A spray assembly is set at the rear end of the dust removal filter. The spray assembly effectively captures and adsorbs dust particles in the air by spraying fine water mist, causing the dust particles to settle, thereby significantly reducing the dust concentration in the air. The gas is dried by the drying assembly, and the dust particles are further intercepted, thereby improving the gas purification effect.

[0014] Optionally, the spray assembly includes a water tank, a water pump and a micro-sprinkler, the water tank is connected to the shell, the water pump is used to pump water in the water tank to the micro-sprinkler, the micro-sprinkler is located on the top of the dust collection box, a water level sensor is provided in the water tank, a warning light is provided on the outer wall of the shell, and the water level sensor is electrically connected to the warning light.

[0015] By adopting the above technical solution, when spraying operation is required, the water pump is started, and the water in the water tank is transported to the micro-sprinkler for water mist spraying under the action of the water pump. When there is a lack of water in the water tank, the water level sensor transmits the water shortage signal to the warning light, and the warning light is on. The construction personnel can replenish the water tank in time, thereby reducing the possibility that the water pump burns out and causes the gas to carry fine dust particles out of the fan body.

[0016] Optionally, the drying component includes a first drying plate and a second drying plate, the first drying plate and the second drying plate are both connected to the inner wall of the shell, the first drying plate is located between the spray component and the second drying plate, a first drying hole is opened on the first drying plate, and the opening area of ​​the first drying hole gradually increases from the center to the peripheral wall, and a second drying hole is opened on the second drying plate, and the opening area of ​​the second drying hole gradually decreases from the center to the peripheral wall.

[0017] By adopting the above technical solution, the opening area of ​​the first drying hole gradually increases from the center to the peripheral wall, so that when the gas passes through, the gas flow rate in the central area is faster, while the gas flow rate in the peripheral wall area is slower. When the gas flows through the second drying hole, the flow rate in the central area is higher, so that the moisture in the gas evaporates. At the same time, the larger dust particles are pushed to the peripheral wall area, while the flow rate in the peripheral wall area is lower, which is conducive to the sedimentation and capture of dust particles, so that large particles of dust in the gas are filtered in the central area, and the opening area of ​​the second drying hole gradually decreases from the center to the peripheral wall, which is conducive to capturing smaller dust particles and avoiding clogging of the drying hole. Through the synergistic effect of the first drying hole and the second drying hole, the filtration efficiency of the gas containing moisture and dust is improved, and the cleanliness of the gas is improved.

[0018] Optionally, a supporting foot is provided at the bottom of the fan body, a locking assembly is inserted into the supporting foot, a supporting platform is provided at the bottom of the supporting foot, and the supporting foot is fixed to the supporting platform by the locking assembly.

[0019] By adopting the above technical solution, the ground may be uneven at the tunnel construction site. During the operation of the fan body, especially under high wind speed or unstable airflow conditions, the fan body is prone to displacement and vibration, which increases noise and may also damage the structure of the fan body and shorten the service life of the equipment. By setting up a support platform, an operating plane is provided for the installation of the fan body, reducing the possibility of shaking of the fan body.

[0020] Optionally, an elastic gasket is connected to one side of the supporting foot, and a side of the elastic gasket away from the supporting foot is in contact with the supporting platform.

[0021] By adopting the above technical solution, an elastic gasket is arranged between the supporting foot and the supporting platform, so as to reduce the direct contact between the supporting foot and the supporting platform, reduce the impact sound and friction sound caused by hard contact, and further reduce the noise.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. Two fan bodies are installed in the tunnel and at the tunnel entrance respectively, forming effective air convection, improving the ventilation efficiency in the tunnel, and quickly updating the air in the tunnel; a dust removal mechanism is set on the air duct to allow air to circulate through the dust removal mechanism, which removes dust from the air passing through the air duct, purifies the gas, reduces the possibility of dust-rich gas discharged from the fan body, reduces the particulate matter contained in the gas discharged from the fan body, and improves the air quality around the tunnel entrance. When the air around the tunnel entrance re-enters the tunnel under the suction effect of the fan body inside the tunnel, the particulate matter in the air is reduced, improving the air purification effect in the tunnel, and facilitating construction workers to carry out construction in the tunnel; by setting a silencer mechanism, the noise generated by the fan body during operation is reduced, the impact of noise on construction workers is reduced, and the construction environment is improved;

[0024] 2. Under the action of the fan body, the gas flows along the air duct, and the gas carrying dust passes through the dust filter. The dust filter intercepts the dust and falls into the dust collecting box at the bottom. The dust is collected and processed, reducing the possibility of dust accumulating at the bottom of the dust filter and clogging the dust filter.

[0025] Optionally, the dust removal mechanism further includes a spray assembly and a drying assembly, and the dust removal filter, the spray assembly and the drying assembly are fixed to the inner wall of the shell in sequence along the direction from the air inlet end to the air outlet end of the air duct;

[0026] 3. After the gas passes through the dust removal filter to intercept dust, the gas still contains fine dust particles that can pass through the dust removal filter. The dust removal effect of the dust removal filter on the gas is limited. A spray component is set at the rear end of the dust removal filter. The spray component effectively captures and adsorbs dust particles in the air by spraying fine water mist, causing the dust particles to settle, thereby significantly reducing the dust concentration in the air. The gas is dried by the drying component, and the dust particles are further intercepted to improve the gas purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application.

[0028] Figure 2 It is a cross-sectional view of the dust removal mechanism in the embodiment of the present application.

[0029] Figure 3 It is a structural diagram of the first drying plate, the second drying plate and the dust removal filter in the embodiment of the present application.

[0030] Figure 4 It is a schematic diagram of the position of the elastic gasket in the embodiment of the present application.

[0031] Description of reference numerals:

[0032] 1. Fan body; 2. First branch pipe; 21. Second branch pipe; 3. Dust removal mechanism; 31. Shell; 32. Dust filter; 33. Dust box; 331. Box body; 332. First guide plate; 333. Second guide plate; 334. First lap joint; 335. Second lap joint; 34. Water tank; 341. Water pump; 342. Micro sprinkler; 343. Box cover; 344. Water level sensor; 345. Warning light; 35. First drying plate; 351. Second drying plate; 4. Silencer mechanism; 5. Support foot; 51. Locking assembly; 52. Support platform; 53. Elastic gasket. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-4 This application is described in further detail.

[0034] The embodiments of the present application disclose a ventilation and dust removal device for tunnel construction.

[0035] Reference Figure 1 A ventilation and dust removal device for tunnel construction includes two fan bodies 1, which are respectively installed in the tunnel and at the tunnel entrance. The two fan bodies 1 are connected through an air duct, and a dust removal mechanism 3 is arranged on the air duct. The dust removal mechanism 3 is used to remove dust in the air passing through the air duct; a silencer mechanism 4 is connected to the air inlet end of the fan body 1. In this embodiment, the silencer mechanism 4 adopts a silencer, and the silencer is cylindrical.

[0036] When air circulation is required in the tunnel, two fan bodies 1 are respectively installed inside the tunnel and at the tunnel entrance, and the two fan bodies 1 are started. The fan body 1 inside the tunnel sucks in the air in the tunnel, and the airflow is silenced by the muffler to reduce noise pollution. The gas passes through the dust removal mechanism 3 under the guidance of the air duct to perform dust removal operation, and the gas is purified and dusted. Subsequently, the airflow is silenced again through the silencer mechanism 4 of the fan body 1 at the tunnel entrance to further reduce noise pollution. The gas is discharged from the fan body 1 at the tunnel entrance, and the particulate matter contained in the gas discharged by the fan body 1 is reduced, thereby improving the air quality around the tunnel entrance. When the air around the tunnel entrance re-enters the tunnel under the suction action of the fan body 1 inside the tunnel, the particulate matter in the air is reduced, thereby improving the air purification effect in the tunnel, facilitating construction personnel to carry out construction in the tunnel, and improving the construction environment.

[0037] The air duct includes a first branch pipe 2 and a second branch pipe 21. The first branch pipe 2 is connected and fixed to the air outlet end of the fan body 1 in the tunnel. The end of the first branch pipe 2 away from the fan body 1 in the tunnel is connected and fixed to the dust removal mechanism 3. The end of the dust removal mechanism 3 away from the first branch pipe 2 is connected and fixed to the second branch pipe 21. The end of the second branch pipe 21 away from the dust removal mechanism 3 is connected and fixed to the air inlet end of the fan body 1 at the tunnel entrance, so that the gas enters from the fan body 1 in the tunnel, passes through the first branch pipe 2, the dust removal mechanism 3 and the second branch pipe 21 in sequence, and is then discharged from the fan body 1 at the tunnel entrance.

[0038] The dust removal mechanism 3 is detachably connected to the first branch pipe 2 and the second branch pipe 21 .

[0039] When the dust removal mechanism 3 is rich in dust, the dust removal mechanism 3 is removed from the first branch pipe 2 and the second branch pipe 21 to facilitate cleaning or maintenance of the dust removal mechanism 3, thereby reducing the possibility of dust accumulation in the dust removal mechanism 3 leading to a decrease in dust removal effect and improving the air purification effect.

[0040] In order to improve the convenience of carrying and disassembly of the ventilation and dust removal device, in this embodiment, the first branch pipe 2 is threadedly connected to the dust removal mechanism 3 and the fan body 1 in the tunnel, and the second branch pipe 21 is threadedly connected to the dust removal mechanism 3 and the fan body 1 at the tunnel entrance. The first branch pipe 2 and the second branch pipe 21 are both made of plastic material to reduce noise transmission when airflow passes through and improve installation convenience.

[0041] Reference Figure 2The dust removal mechanism 3 includes a shell 31, a dust filter 32 and a dust box 33. The air inlet end of the shell 31 is threadedly connected to the first branch pipe 2, and the air outlet end of the shell 31 is threadedly connected to the second branch pipe 21. The outer wall of the dust filter 32 is fixed to the inner wall of the shell 31. The dust filter 32 is located at the air inlet end of the shell 31. The dust filter 32 is used to intercept dust in the air. The dust box 33 is connected to the shell 31 and is located at the bottom of the dust filter 32. The dust box 33 is used to collect intercepted dust.

[0042] When the gas flows along the air duct to the dust filter 32 under the action of the fan body 1, the gas carrying dust passes through the dust filter 32, the dust filter 32 intercepts the dust, and the dust falls into the dust collecting box 33 at the bottom, which is convenient for collecting and processing the dust and reduces the possibility of dust accumulating at the bottom of the dust filter 32 and clogging the dust filter 32.

[0043] A dust collecting groove is provided at the bottom of the shell 31, and the dust collecting groove is connected with the interior of the shell 31. The dust box 33 is placed in the dust collecting groove. When too much dust accumulates in the dust box 33, the dust box 33 is taken out from the dust collecting groove to facilitate timely disposal of the dust.

[0044] The dust removal mechanism 3 also includes a spray assembly and a drying assembly. Along the direction from the air inlet end to the air outlet end of the air duct, the dust removal filter 32, the spray assembly and the drying assembly are fixed to the inner wall of the shell 31 in sequence, so that the gas passes through the dust removal filter 32, the spray assembly and the drying assembly in sequence, further improving the purification degree of the gas.

[0045] The spray assembly includes a water tank 34, a water pump 341 and a micro-sprinkler 342. The water tank 34 is fixed to the shell 31. The water tank 34 is provided with a water inlet, and a box cover 343 is threadedly connected to the water inlet. In this embodiment, the water pump 341 adopts a micro shallow water pump 341, and the water pump 341 is placed and immersed in the water of the water tank 34. The water pump 341 is used to pump water in the water tank 34 to the micro-sprinkler 342, and the micro-sprinkler 342 is located at the top of the dust collecting box 33.

[0046] When the gas passes through the dust filter 32, the water pump 341 is started, and the water in the water tank 34 is transported to the micro-sprinkler 342 for water mist spraying, which effectively captures and adsorbs dust particles in the air and causes the dust particles to settle, thereby significantly reducing the dust concentration in the gas.

[0047] A water level sensor 344 is provided in the water tank 34, and a warning light 345 is provided on the outer wall of the shell 31. The water level sensor 344 is electrically connected to the warning light 345. The water level sensor 344 is used to sense the water level. When the water pump 341 is exposed to the water surface, the water level sensor 344 transmits a water shortage signal to the warning light 345, and the warning light 345 lights up. The construction personnel can replenish the water tank 34 in time to reduce the possibility that the water pump 341 burns out and causes the gas to carry fine dust particles out of the fan body 1.

[0048] Reference Figure 3 The drying component includes a first drying plate 35 and a second drying plate 351. The first drying plate 35 and the second drying plate 351 are both connected to the inner wall of the shell 31 and are located at the air outlet end of the shell 31. The first drying plate 35 is located between the micro-sprinkler 342 and the second drying plate 351 and is located on the top of the dust collecting box 33. A first drying hole is opened on the first drying plate 35, and the opening area of ​​the first drying hole gradually increases from the center to the peripheral wall. A second drying hole is opened on the second drying plate, and the opening area of ​​the second drying hole gradually decreases from the center to the peripheral wall.

[0049] The opening area of ​​the first drying hole gradually increases from the center to the peripheral wall, so that when the gas passes through, the gas flow rate in the central area is faster, while the gas flow rate in the peripheral wall area is slower. When the gas flows through the second drying hole, the flow rate in the central area is higher, which evaporates the water in the gas. At the same time, the larger dust particles are pushed to the peripheral wall area, while the flow rate in the peripheral wall area is lower, which helps to settle and capture the dust particles, so that the large dust particles in the gas are filtered in the central area, and the opening area of ​​the second drying hole gradually decreases from the center to the peripheral wall, which helps to capture smaller dust particles and avoid clogging of the drying hole. Through the synergistic effect of the first drying hole and the second drying hole, the filtration efficiency of the gas containing moisture and dust is improved, and the cleanliness of the gas is improved.

[0050] The dust box 33 includes a box body 331, a first guide plate 332 and a second guide plate 333. The box body 331 is placed in the dust collecting groove. A dust inlet is provided on the top of the box body 331. A first lap joint 334 is connected to the inner wall of the box body 331 near the dust inlet. The first guide plate 332 is installed in the dust box 33 by lap jointing the first lap joint 334. The first guide plate 332 is in an eight-shaped shape. There is a gap between the two sides of the guide plate that are inclined in the eight-shaped shape and the inner wall of the box body 331, so that dust can enter the dust box 33. A second lap joint 335 is provided at the bottom of the lap joint 334, and the second lap joint 335 is connected to the inner wall of the box body 331. The second guide plate 333 is installed in the box body 331 by overlapping the second lap joint 335. The second guide member is in an inverted eight shape, and a dust inlet groove is opened in the middle of the second guide member. The dust dropped from the first guide plate 332 enters the dust collecting box 33 through the dust inlet groove, thereby blocking the dust and reducing the possibility that the dust in the dust collecting box 33 moves with the airflow under the action of the airflow and causes the first drying plate 35 to be blocked.

[0051] The ground of the tunnel construction site is uneven. In order to reduce the possibility of the fan body 1 swinging, refer to Figure 4 The bottom wall of the fan body 1 is fixedly connected with a support foot 5, and a locking assembly 51 is inserted into the support foot 5. A support platform 52 is provided at the bottom of the support foot 5. The support foot 5 is fixed to the support platform 52 through the locking assembly 51. In this embodiment, the locking assembly 51 adopts bolts and nuts, and the support platform 52 provides a flat installation surface for the operation of the fan body 1.

[0052] In order to reduce the possibility of impact and friction sounds caused by direct contact between the support leg 5 and the support platform 52, an elastic gasket 53 is fixed to the bottom wall of the support leg 5, and the side of the elastic gasket 53 away from the support leg 5 is in contact with the support platform 52, thereby reducing noise.

[0053] The implementation principle of the ventilation and dust removal device for tunnel construction in the embodiment of the present application is as follows: when air circulation is required in the tunnel, two fan bodies 1 are respectively installed inside the tunnel and at the tunnel entrance, and the two fan bodies 1 are started. The fan body 1 in the tunnel sucks in the air in the tunnel, and the airflow is silenced by the muffler to reduce noise pollution. Under the guidance of the air duct, the gas passes through the dust removal filter to filter dust, the spray head to spray and settle dust, and the first drying plate 35 and the second drying plate 351 to dry the airflow, etc., to purify and remove dust from the gas. Subsequently, the airflow is silenced again by the silencer mechanism 4 of the fan body 1 at the tunnel entrance to further reduce noise pollution. The gas is discharged from the fan body 1 at the tunnel entrance to reduce the particulate matter contained in the gas discharged by the fan body 1 and improve the air quality around the tunnel entrance. When the air around the tunnel entrance re-enters the tunnel under the suction action of the fan body 1 inside the tunnel, the particulate matter in the air is reduced, thereby improving the air purification effect in the tunnel, facilitating construction personnel to carry out construction in the tunnel and improving the construction environment.

[0054] The above are all preferred embodiments of the present application. The embodiments are only explanations of the present application and do not limit the protection scope of the present application in turn. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A ventilation and dust removal device for tunnel construction, characterized in that: The invention comprises two fan bodies (1), wherein the two fan bodies (1) are connected via an air duct, and a dust removal mechanism (3) is provided on the air duct, wherein the dust removal mechanism (3) is used to remove dust in the air passing through the air duct; and a silencer mechanism (4) is connected to the air inlet end of the fan body (1).

2. The ventilation and dust removal device for tunnel construction according to claim 1, characterized in that: The air duct comprises a first branch pipe (2) and a second branch pipe (21); the first branch pipe (2) is connected to the dust removal mechanism (3), and the dust removal mechanism (3) is connected to the second branch pipe (21); one end of the first branch pipe (2) and the second branch pipe (21) away from the dust removal mechanism (3) are respectively connected to the two fan bodies (1); and the dust removal mechanism (3) is detachably connected to the first branch pipe (2) and the second branch pipe (21).

3. The ventilation and dust removal device for tunnel construction according to claim 2, characterized in that: The dust removal mechanism (3) comprises a shell (31), a dust removal filter (32) and a dust collection box (33); the air inlet end of the shell (31) is connected to the first branch pipe (2); the air outlet end of the shell (31) is connected to the second branch pipe (21); the outer wall of the dust removal filter (32) is connected to the inner wall of the shell (31); the dust removal filter (32) is used to intercept dust in the air; the dust collection box (33) is connected to the shell (31) and is located at the bottom of the dust removal filter (32); and the dust collection box (33) is used to collect intercepted dust.

4. The ventilation and dust removal device for tunnel construction according to claim 3, characterized in that: The dust removal mechanism (3) further comprises a spray assembly and a drying assembly. Along the direction from the air inlet end to the air outlet end of the air duct, the dust removal filter (32), the spray assembly and the drying assembly are fixed to the inner wall of the shell (31) in sequence.

5. The ventilation and dust removal device for tunnel construction according to claim 4, characterized in that: The spray assembly comprises a water storage tank (34), a water pump (341) and a micro-sprinkler (342); the water storage tank (34) is connected to the housing (31); the water pump (341) is used to pump water in the water storage tank (34) to the micro-sprinkler (342); the micro-sprinkler (342) is located on the top of the dust collecting box (33); a water level sensor (344) is provided in the water storage tank (34); a warning light (345) is provided on the outer wall of the housing (31); and the water level sensor (344) is electrically connected to the warning light (345).

6. The ventilation and dust removal device for tunnel construction according to claim 4, characterized in that: The drying assembly comprises a first drying plate (35) and a second drying plate (351), the first drying plate (35) and the second drying plate (351) are both connected to the inner wall of the shell (31), the first drying plate (35) is located between the spray assembly and the second drying plate (351), a first drying hole is opened on the first drying plate (35), and the opening area of ​​the first drying hole gradually increases from the center to the peripheral wall, and a second drying hole is opened on the second drying plate, and the opening area of ​​the second drying hole gradually decreases from the center to the peripheral wall.

7. The ventilation and dust removal device for tunnel construction according to claim 1, characterized in that: A support foot (5) is provided at the bottom of the fan body (1), a locking assembly (51) is inserted into the support foot (5), a support platform (52) is provided at the bottom of the support foot (5), and the support foot (5) is fixed to the support platform (52) via the locking assembly (51).

8. The ventilation and dust removal device for tunnel construction according to claim 7, characterized in that: One side of the support leg (5) is connected to an elastic gasket (53), and the side of the elastic gasket (53) away from the support leg (5) is in contact with the support platform (52).

Images