Construction ventilation system inside the tunnel

Abstract

This invention provides a ventilation device for tunnel construction, including an air supply duct, an air inlet duct rotatably mounted inside one end of the air supply duct, an air inlet valve mounted on the end of the air inlet duct opposite to the air supply duct, and a dehumidification box fitted on the outside of the air supply duct. The air inlet duct can be connected to or disconnected from the dehumidification box. Air inlets are provided on both sides of the dehumidification box, and an evaporation assembly and a condenser are sequentially arranged inside the dehumidification box corresponding to the air inlets. The evaporation assembly has a support frame corresponding to the air inlets, and dehumidification plates are evenly arranged inside the support frame. A desiccant mechanism for removing condensate from the sides of the dehumidification plates is slidably mounted on their outer side. The tunnel construction ventilation device of this invention can switch the connection or disconnection between the air inlet duct and the dehumidification box as needed, enabling the device to have both direct air supply and dehumidification air supply ventilation modes, meeting the ventilation needs under different external air conditions during tunnel construction and reducing the humidity inside the tunnel.

Description

Technical Field

[0001] This invention belongs to the field of tunnel ventilation technology, and specifically relates to a construction ventilation device for tunnels. Background Technology

[0002] Humidity control during tunnel construction is a crucial aspect of ensuring project quality, construction safety, and operational efficiency. High humidity environments can lead to problems such as abnormal concrete setting, equipment corrosion, and slippery work surfaces, necessitating the implementation of control measures.

[0003] Bringing outside air into a tunnel can usually reduce humidity levels inside the tunnel. However, if the outside air itself is highly humid, directly introducing it into the tunnel may not be effective in reducing internal humidity and could even worsen the problem. In such cases, pre-dehumidifying the outside air can more effectively control humidity levels inside the tunnel.

[0004] In the prior art, Chinese invention patent application with publication number CN115977716A discloses a tunnel intelligent reversing ventilation device and its ventilation system, which uses a desiccant inside the dehumidification ring to adsorb moisture in the air to reduce the humidity of the air sent into the tunnel; however, the desiccant needs to be replaced regularly, resulting in high labor and maintenance costs; and the desiccant easily adsorbs dust and other impurities, affecting the dehumidification efficiency.

[0005] Therefore, it is necessary to design a tunnel construction ventilation device that can deliver outside air directly or after dehumidification into the tunnel as needed, reduce the humidity inside the tunnel, and save on manual maintenance costs to solve the current technical problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a tunnel construction ventilation device that can directly or dehumidify external air and introduce it into the tunnel as needed, thereby reducing the humidity inside the tunnel and saving on manual maintenance costs.

[0007] The technical solution of the present invention is as follows: a ventilation device for construction in a tunnel, including an air supply duct, a fan is installed inside one end of the air supply duct, an air inlet duct is rotatably installed inside the other end of the air supply duct, an air inlet valve is installed on the end of the air inlet duct opposite to the air supply duct, a dehumidification box is fitted on the outside of the air supply duct, and the air inlet duct can be connected to or disconnected from the dehumidification box.

[0008] The dehumidification box is provided with air inlets on both sides, and the evaporation unit and condenser are arranged in sequence inside the dehumidification box corresponding to the air inlets;

[0009] The evaporation assembly has a support frame corresponding to the air inlet window, and dehumidification plates are evenly arranged inside the support frame. Evaporation pipes are arranged inside the dehumidification plates.

[0010] The outer side of the dehumidification plate is provided with a water removal mechanism for removing condensate from its side, and the top of the dehumidification box is provided with a lifting drive mechanism for driving the water removal mechanism to move up and down.

[0011] Furthermore, the dewatering mechanism has an upper support plate and a lower support plate that are arranged opposite each other, and an elastic water-absorbing component that contacts the side of the dehumidifying plate is provided between the upper support plate and the lower support plate.

[0012] Furthermore, the bottom of the support frame is fixedly provided with support columns corresponding to the bottom two sides of the lower support plate.

[0013] Furthermore, a cleaning mechanism is provided below the dehumidifying plate, which is used to spray cleaning water onto the elastic water-absorbing component.

[0014] Furthermore, the cleaning mechanism has water equalization chambers symmetrically arranged on both sides of the evaporation pipe at the lower end of the dehumidification plate, and a water outlet plate cavity corresponding to the dehumidification plate is fixedly arranged on the top of the water equalization chamber, and water outlet holes are uniformly arranged on the outer side of the water outlet plate cavity.

[0015] Furthermore, a sliding rod is vertically fixed at the top of each of the four corners of the lower support plate. The sliding rod is slidably connected to the upper support plate. A stop block is fixedly installed at the end of the sliding rod above the upper support plate. A return spring is fitted on the outer side of the sliding rod between the upper support plate and the lower support plate.

[0016] Furthermore, the lifting drive mechanism has a gate frame fixedly installed on the top of the dehumidification box. Inside the gate frame, a lead screw is rotatably connected to it in the vertical direction. A lifting drive motor for driving the lead screw to rotate is installed on the gate frame. A lifting plate is threadedly connected to the lead screw. Sliding rods are fixedly installed at the bottom of both ends of the lifting plate. The sliding rods are slidably connected to the top of the dehumidification box and the top of the support frame. The top of the water removal mechanism is fixedly connected to the bottom end of the sliding rod.

[0017] Furthermore, the air supply duct inside the dehumidification box has an outer connecting port arranged in a circular array, and the air inlet duct is provided with an inner connecting port that cooperates with the outer connecting port. The dehumidification box is provided with a rotary drive mechanism; the rotary drive mechanism is used to drive the air inlet duct to rotate relative to the air supply duct so that the inner connecting port corresponds to or is misaligned with the outer connecting port.

[0018] Furthermore, a gear ring is fixedly fitted on the outer side of the air inlet duct, and a gear meshes on the gear ring. A rotary drive motor that drives the gear to rotate is provided on the dehumidification box.

[0019] Furthermore, a dehumidifying valve is provided on the air intake window.

[0020] The beneficial effects of this invention are:

[0021] (1) The tunnel construction ventilation device of the present invention can switch the connection or cut-off between the air inlet duct and the dehumidification box as needed, so that the device has two ventilation modes: direct air supply and dehumidification air supply, which can meet the ventilation needs under different external air conditions during tunnel construction and reduce the humidity inside the tunnel.

[0022] (2) In this device, the air inlet area in the dehumidification and air supply state is larger than the air inlet area in the direct air supply state. Under the premise of fixed air supply to the tunnel, the airflow velocity inside the air inlet window in the dehumidification and air supply state is lower than the airflow velocity inside the air inlet duct in the direct air supply state, so that the outside air has a longer time to contact the dehumidification plate 52, thereby improving the removal effect of water vapor in the air.

[0023] (3) During the operation of the ventilation device in the tunnel, the lifting drive mechanism periodically drives the dewatering mechanism to move on the outside of the dehumidification plate, which can remove the condensate on the outside of the dehumidification plate and reduce the impact of condensate on the condensation efficiency of the dehumidification plate. Attached Figure Description

[0024] Figure 1 This is one of the structural schematic diagrams of the tunnel construction ventilation device in this invention.

[0025] Figure 2 This is the second schematic diagram of the ventilation device for tunnel construction in this invention.

[0026] Figure 3 This is the third schematic diagram of the ventilation device for tunnel construction in this invention.

[0027] Figure 4 for Figure 3 Cross-sectional view at point AA.

[0028] Figure 5 This is a schematic diagram of the air intake duct in the tunnel construction ventilation device of the present invention.

[0029] Figure 6 This is one of the structural schematic diagrams of the lifting drive mechanism and evaporation component in the tunnel construction ventilation device of the present invention.

[0030] Figure 7 This is the second schematic diagram of the lifting drive mechanism and evaporation component in the tunnel construction ventilation device of the present invention.

[0031] Figure 8 for Figure 7 A magnified view of a section at point B in the middle.

[0032] Figure 9 for Figure 7 A magnified view of a section at point C. Detailed Implementation

[0033] Various exemplary embodiments of the invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the invention or its application or use. The invention can be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0034] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, without excluding the possibility of encompassing other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] like Figures 1 to 9As shown, the ventilation device for tunnel construction includes an air supply duct 2. A fan 21 is installed inside one end of the air supply duct 2, and an air inlet duct 1 is rotatably installed inside the other end of the air supply duct 2. An air inlet valve 11 is installed on the end of the air inlet duct 1 facing away from the air supply duct 2. A dehumidification box 3 is fitted onto the outside of the air supply duct 2. The air inlet duct 1 can communicate with or be shut off from the interior of the dehumidification box 3. Air inlets 31 are provided on both sides of the dehumidification box 3. An evaporation assembly 5 and a condenser 6 are sequentially arranged inside the dehumidification box 3 corresponding to the air inlets 31. The evaporation assembly 5 has a support frame 51 corresponding to the air inlets 31. Dehumidification plates 52 are evenly arranged inside the support frame 51, vertically positioned inside the support frame 51. The upper end of the dehumidification plates 52 is fixedly connected to the support frame 51. The interior of the dehumidifier 2 is equipped with an evaporation pipe 53; a desiccant 7 for removing condensate from the side of the dehumidifier plate 52 is slidably provided along its outer side, and a lifting drive mechanism 8 for driving the desiccant 7 to move up and down is provided on the top of the dehumidifier box 3; in this embodiment, the end of the air supply duct 2 near the fan 21 is used to connect to the air duct, and the fan 21 sends the outside air into the interior of the tunnel through the air duct. When the outside air humidity is low, the air supply duct 1 and the dehumidifier box 3 are cut off, and the fan 21 directly draws the outside air into the tunnel through the air supply duct 1. When the outside air humidity is high, directly sending it into the tunnel may not effectively reduce the internal humidity. At this time, the air supply duct 1 and the interior of the dehumidifier box 3 are connected, and the refrigeration circuit of the evaporator assembly 5 and the condenser 6 is started. The air inlet valve 11 opens the air supply valve. The end of the air inlet duct 1 is closed. External air enters the interior of the air inlet duct 1 after passing through the air inlet window 31, the evaporator 5, and the condenser 6 in sequence. After the evaporator 5 condenses and removes some of the water vapor in the external air, the dehumidified air is then sent into the tunnel by the fan 21, effectively reducing the humidity inside the tunnel. The tunnel construction ventilation device in the above embodiment can switch the connection or disconnection between the air inlet duct 1 and the dehumidification box 3 as needed, so that the device has two ventilation modes: direct air supply and dehumidification air supply, which can meet the ventilation needs under different external air conditions during tunnel construction and reduce the humidity inside the tunnel. In the dehumidification air supply mode, external air enters the air supply duct 2 through multiple air inlets 31, while in the direct air supply mode, external air enters the air supply duct 2 only through the air inlet duct 1. By increasing the number of air inlets 31 on both sides of the dehumidification box 3, the air inlet area in the dehumidification air supply state is larger than that in the direct air supply state. Under the premise of fixed air supply volume to the tunnel, the airflow velocity inside the air inlet 31 in the dehumidification air supply state is lower than that inside the air inlet duct 1 in the direct air supply state, allowing the outside air to have a longer contact time with the dehumidification plate 52, thus improving the removal effect of water vapor in the air. The accumulation of condensate on the outside of the dehumidification plate 52 will affect its condensation efficiency. During the operation of the ventilation device in the tunnel, the lifting drive mechanism 8 periodically drives the water removal mechanism 7 to move on the outside of the dehumidification plate 52, which can remove the condensate on the outside of the dehumidification plate 52 and reduce the impact of condensate on the condensation efficiency of the dehumidification plate 52.The evaporator pipe, condenser 6, expansion valve, and compressor in the aforementioned evaporator assembly 5 are connected to form a refrigeration circuit, which is existing technology and will not be described in detail here. A base frame 34 is symmetrically arranged at the bottom of the aforementioned dehumidification box 3, providing support for the dehumidification box 3. A drain valve 32 is provided on one side of the bottom of the dehumidification box 3, used to discharge the condensate collected inside the dehumidification box 3.

[0036] As one specific implementation of the aforementioned water removal mechanism 7, such as Figure 7 and 8 As shown, the dewatering mechanism 7 has an upper support plate 72 and a lower support plate 71 arranged correspondingly. Both the upper support plate 72 and the lower support plate 71 have clearance openings 721 corresponding to the dehumidification plate 52. An elastic water-absorbing component 73 is provided between the upper support plate 72 and the lower support plate 71 to contact the side of the dehumidification plate 52. During the periodic movement of the dewatering mechanism 7 by the lifting drive mechanism 8, the elastic water-absorbing component 73 can absorb the condensate on the outside of the dehumidification plate 52 and wipe the outside of the dehumidification plate 52, thereby removing the condensate on the outside of the dehumidification plate 52 and reducing the impact of condensate on the condensation efficiency of the dehumidification plate 52. Specifically, the above-mentioned elastic water-absorbing component 73 is a high-density polyurethane sponge or a wood pulp fiber sponge.

[0037] In some embodiments, guide rods 77 are fixedly provided on both sides of the support frame 51 in the vertical direction, and the middle of both ends of the upper support plate 72 and the lower support plate 71 are slidably connected to the guide rods 77.

[0038] In some embodiments, the top of the dehumidifying plate 52 is fixedly connected to the inside of the support frame 51 via a connecting handle (not shown in the figure), thereby achieving a fixed connection between the dehumidifying plate 52 and the support frame 51. Specifically, at least two connecting handles are symmetrically arranged on the top of the dehumidifying plate 52. The connecting handle is a cylindrical structure integral with the top of the dehumidifying plate 52. The top of the connecting handle is provided with an internal threaded hole. The upper end of the connecting handle is bolted to the top of the support frame 51, thereby achieving the fixation of the dehumidifying plate 52 inside the support frame 51.

[0039] In some embodiments, such as Figure 9 As shown, the bottom of the support frame 51 is fixedly provided with support columns 78 corresponding to the bottom sides of the lower support plate 71. During the process of the lifting drive mechanism 8 driving the water removal mechanism 7 to move on the outside of the dehumidification plate 52, the lower support plate 71 first contacts the support columns 78. As the lifting drive mechanism 8 drives the water removal mechanism 7 to continue moving, the upper support plate 72 presses down on the elastic water absorption component 73, squeezing out the condensate absorbed inside the elastic water absorption component 73, so that the condensate on the outside of the dehumidification plate 52 can be absorbed and removed next time.

[0040] In some embodiments, although the installation of a primary filter in the air inlet 31 can reduce the amount of dust entering the dehumidification box 3, a small amount of dust will still inevitably enter. The dust adheres to the outside of the dehumidification plate 52 along with the condensate. During the process of the water removal mechanism 7 removing the condensate, it will adhere to the elastic water absorption component 73. A cleaning mechanism 9 is provided below the dehumidification plate 52. The cleaning mechanism 9 is used to spray cleaning water onto the elastic water absorption component 73. While the cleaning mechanism 9 sprays cleaning water onto the elastic water absorption component 73, the lifting drive mechanism 8 drives the water removal mechanism 7 to move back and forth within a certain range, so that the upper support plate 72 continuously squeezes and cleans the elastic water absorption component 73, removing large particles of dirt such as dust from the outside of the elastic water absorption component 73 and dirty water from the gaps inside the elastic water absorption component 73.

[0041] As one specific implementation of the cleaning mechanism 9, such as Figure 7 and 9 As shown, the cleaning mechanism 9 has water distribution chambers 91 symmetrically arranged on both sides of the evaporation pipe 53 at the lower end of the dehumidification plate 52. A water outlet plate cavity 92 corresponding to the dehumidification plate 52 is fixedly arranged on the top of the water distribution chamber 91. The bottom end of the water outlet plate cavity 92 is connected to the water distribution chamber 91. Water outlet holes (not shown in the figure) are evenly arranged on the outer side of the water outlet plate cavity 92. A water supply pipeline is connected to the water distribution chamber 91, and a water pump is connected to the water supply pipeline. The water pump pumps external clean water into the interior of the water distribution chamber 91, distributes it into the water outlet plate cavity 92 through the water distribution chamber 91, and finally sprays it outward from the water outlet hole on the water outlet plate cavity 92 to the outside of the elastic water absorption component 73. With the continuous squeezing of the elastic water absorption component 73 by the upper support plate 72, the elastic water absorption component 73 is rinsed.

[0042] In some embodiments, such as Figure 7 and 8 As shown, a sliding rod 74 is vertically fixed at the top of the four corners of the lower support plate 71. The sliding rod 74 is slidably connected to the upper support plate 72. A stop block 75 is fixedly installed at the end of the sliding rod 74 above the upper support plate 72. A return spring 76 is fitted on the outside of the sliding rod 74 between the upper support plate 72 and the lower support plate 71. The guiding function of the sliding rod 74 can prevent the upper support plate 72 and the lower support plate 71 from shifting. After the upper support plate 72 and the lower support plate 71 come into close contact and squeeze the elastic water-absorbing component 73, the elastic support function of the return spring 76 can push the upper support plate 72 and the lower support plate 71 to separate after the pressure is released.

[0043] In some embodiments, such as Figure 7As shown, the lifting drive mechanism 8 has a portal frame 82 fixedly mounted on the top of the dehumidification box 3. Inside the portal frame 82, a lead screw 85 is vertically connected to it. A lifting drive motor 86 is mounted on the portal frame 82 to drive the lead screw 85. A lifting plate 84 is threadedly connected to the lead screw 85. Sliding rods 83 are fixedly mounted at both ends of the lifting plate 84. The sliding rods 83 are slidably connected to the top of the dehumidification box 3 and the top of the support frame 51. The top of the water removal mechanism 7 is fixedly connected to the bottom end of the sliding rods 83. The lifting drive motor 86 drives the lead screw 85 to rotate, and the threaded structure between the lead screw 85 and the lifting plate 84 drives the lifting plate 84 to rotate. 4. The sliding rod 83 moves up and down, which in turn drives the water removal mechanism 7 to move along the dehumidification plate 52, removing condensate from the outside of the dehumidification plate 52 and continuously squeezing the water removal mechanism 7 to clean the elastic water absorption component 73. The lifting drive motor 86 is a servo motor with high position control accuracy, which can accurately control the movement of the water removal mechanism 7 along the dehumidification plate 52 and continuously squeeze the water removal mechanism 7 as needed. The bottom of the frame 82 is fixedly provided with a mounting base plate 81, and the bottom end of the lead screw 85 is rotatably connected to the mounting base plate 81. The mounting base plate 81 is fixedly mounted on the top of the dehumidification box 3.

[0044] In some embodiments, such as Figure 3 and 4 As shown, the air supply duct 2 inside the dehumidification box 3 has an outer connecting port 22 arranged in a circular array, and the air inlet duct 1 is provided with an inner connecting port 12 that cooperates with the outer connecting port 22. The dehumidification box 3 is provided with a rotary drive mechanism 4 that drives the air inlet duct 1 to rotate relative to the air supply duct 2. The rotary drive mechanism 4 is used to drive the air inlet duct 1 to rotate relative to the air supply duct 2 so that the inner connecting port 12 corresponds to or is misaligned with the outer connecting port 22. When the inner connecting port 12 corresponds to the outer connecting port 22, the air inlet duct 1 can communicate with the interior of the dehumidification box 3. When the inner connecting port 12 is misaligned with the outer connecting port 22, the air inlet duct 1 can be cut off from the interior of the dehumidification box 3. Specifically, the air supply duct 2 has four outer connecting ports 22 arranged in a circular array, and the corresponding air inlet duct 1 has four inner connecting ports 12 arranged in a circular array. The rotary drive mechanism 4 drives the air inlet duct 1 to rotate 45° relative to the air supply duct 2 each time.

[0045] In some embodiments, such as Figure 3 and 5 As shown, a gear ring 43 is fixedly mounted on the outer side of the air inlet duct 1, and a gear 42 meshes on the gear ring 43. A rotary drive motor 41 that drives the gear 42 to rotate is provided on the dehumidification box 3. The rotary drive motor 41 is a geared servo motor, which has high angle control accuracy and can output a large torque.

[0046] In some embodiments, a dehumidifying valve 33 is provided on the air inlet window 31. When the ventilation device in the tunnel is operating in the direct air supply state, the outside air does not need to enter the air inlet window 31. At this time, closing the dehumidifying valve 33 can reduce the amount of dust entering the dehumidifying box 3 from the air inlet window 31.

[0047] In the above embodiments, the air inlet valve 11 is an electrically controlled ventilation butterfly valve, and the dehumidification valve 33 is an electric louver valve.

[0048] The various embodiments of the present invention have now been described in detail. To avoid obscuring the concept of the invention, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0049] The embodiments described above only illustrate some implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A tunnel construction ventilation device, characterized by: The air supply cylinder is internally provided with a fan at one end, and an air inlet cylinder is rotatably arranged at the other end of the air supply cylinder, and an air inlet valve is arranged at the end of the air inlet cylinder away from the air supply cylinder, and a dehumidification box is sleeved outside the air supply cylinder, and the air inlet cylinder can be communicated or cut off with the dehumidification box. Both sides of the dehumidification box are provided with air inlet windows, and the inside of the dehumidification box is sequentially provided with an evaporation assembly and a condenser corresponding to the air inlet window. The evaporation assembly has a support frame corresponding to the air inlet window, and the inside of the support frame is uniformly provided with a dehumidification plate, and the inside of the dehumidification plate is provided with an evaporation pipeline. The outer side of the dehumidification plate is provided with a water removal mechanism for removing the condensed water on the side of the dehumidification plate, and the top of the dehumidification box is provided with a lifting driving mechanism for driving the water removal mechanism to move up and down. The water removal mechanism has an upper support plate and a lower support plate arranged in a one-to-one correspondence, and an elastic water absorbing component is arranged between the upper support plate and the lower support plate and in contact with the side of the dehumidification plate. The top of the lower support plate is vertically fixedly provided with a slide rod at the four corners, the slide rod is slidably connected with the upper support plate, the end of the slide rod above the upper support plate is fixedly provided with a stop block, and a return spring is sleeved outside the slide rod between the upper support plate and the lower support plate. The air supply cylinder inside the dehumidification box is circumferentially arranged with an outer communication port, the air inlet cylinder is provided with an inner communication port matched with the outer communication port, and the dehumidification box is provided with a rotary driving mechanism; the rotary driving mechanism is used to drive the air inlet cylinder to rotate relative to the air supply cylinder, so that the inner communication port and the outer communication port are correspondingly arranged or misaligned. The air inlet window is provided with a dehumidification air valve.

2. A tunnel construction ventilation device according to claim 1, characterised in that: The bottom of the support frame is fixedly provided with a support column corresponding to the bottom of the lower support plate on both sides.

3. A tunnel construction ventilation device according to claim 2, characterised in that: A cleaning mechanism is arranged below the dehumidification plate, and the cleaning mechanism is used to spray cleaning water on the elastic water absorbing component.

4. A tunnel construction ventilation device according to claim 3, characterised in that: The cleaning mechanism has a water distribution cavity symmetrically arranged on both sides of the evaporation pipeline at the lower end of the dehumidification plate, the top of the water distribution cavity is fixedly provided with a water outlet plate cavity corresponding to the dehumidification plate, and the outer side of the water outlet plate cavity is uniformly provided with a water outlet hole.

5. The in-tunnel construction ventilation device of claim 1, wherein: The lifting driving mechanism has a door-shaped frame fixedly arranged at the top of the dehumidification box, a lead screw is rotatably arranged in the door-shaped frame in a vertical direction, a lifting driving motor is arranged on the door-shaped frame and used to drive the lead screw to rotate, a lifting plate is threadedly connected with the lead screw, sliding rods are fixedly arranged at the bottom of both ends of the lifting plate, the sliding rods are slidably connected with the top of the dehumidification box and the top of the support frame, and the top of the water removal mechanism is fixedly connected with the bottom end of the sliding rod.

6. The in-tunnel construction ventilation device of claim 1, wherein: The outer side of the air inlet cylinder is fixedly sleeved with a gear ring, the gear ring is engaged with a gear, and the dehumidification box is provided with a rotary driving motor for driving the gear to rotate.

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