Ventilation device for construction in tunnel

Abstract

The invention provides a ventilation device for construction in a tunnel. The ventilation device comprises an air supply barrel, an air inlet barrel is rotationally arranged in one end of the air supply barrel, an air inlet valve is arranged at the end, away from the air supply barrel, of the air inlet barrel, the outer side of the air supply barrel is sleeved with a dehumidification box, and the air inlet barrel can be communicated with or disconnected from the dehumidification box; air inlet windows are arranged on the two sides of the dehumidification box. An evaporation assembly and a condenser are sequentially arranged in the dehumidification box and correspond to the air inlet windows. The evaporation assembly is provided with a supporting frame corresponding to the air inlet window, and dehumidification plates are evenly arranged in the supporting frame. A water removal mechanism for removing condensate water on the side surface of the dehumidification plate is arranged on the outer side of the dehumidification plate in a sliding manner; according to the ventilation device for construction in the tunnel, connection or disconnection of the air inlet barrel and the interior of the dehumidification box can be switched according to needs, so that the ventilation device has two ventilation modes of direct air supply and dehumidification air supply, the ventilation requirements under different external air conditions in non-tunnel construction are met, and the humidity in the tunnel is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel ventilation, and in particular relates to a construction ventilation device in a tunnel. Background Art

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

[0003] Bringing outside air into a tunnel can usually reduce the humidity level inside the tunnel. However, if the outside air is already high in humidity, directly bringing it into the tunnel may not be enough to reduce the humidity inside the tunnel, and may even make the problem worse. In this case, pre-dehumidifying the outside air can more effectively control the humidity level inside the tunnel.

[0004] In the prior art, a Chinese invention patent application with publication number CN115977716A discloses an intelligent tunnel reversing ventilation device and ventilation system thereof, which absorbs moisture from the air through a desiccant inside a dehumidification ring to reduce the humidity of the air delivered into the tunnel. The desiccant needs to be replaced regularly, resulting in high labor and maintenance costs. In addition, the desiccant easily absorbs impurities such as dust, affecting dehumidification efficiency.

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

[0006] In view of the deficiencies in the prior art, the present invention provides a tunnel construction ventilation device that can deliver external air directly or after dehumidification as needed into the tunnel, thereby reducing the humidity inside the tunnel and saving labor maintenance costs.

[0007] The technical solution of the present invention is as follows: a tunnel construction ventilation device includes an air supply tube, a fan is provided inside one end of the air supply tube, an air inlet tube is rotatably provided inside the other end of the air supply tube, an air inlet valve is provided on the end of the air inlet tube facing away from the air supply tube, a dehumidification box is sheathed on the outside of the air supply tube, and the air inlet tube can be connected to or blocked from the dehumidification box;

[0008] Air inlet windows are provided on both sides of the dehumidification box, and an evaporation component and a condenser are sequentially provided inside the dehumidification box corresponding to the air inlet windows;

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

[0010] The outer side of the dehumidification plate is provided with a dewatering mechanism for removing condensed water on its side surface, and the top of the dehumidification box is provided with a lifting driving mechanism for driving the dewatering mechanism to move up and down.

[0011] Furthermore, the dewatering mechanism comprises an upper supporting plate and a lower supporting plate which are arranged correspondingly up and down, and an elastic water absorbing component which contacts the side surface of the dehumidification plate is arranged between the upper supporting plate and the lower supporting plate.

[0012] Furthermore, support columns corresponding to both sides of the bottom of the lower support plate are fixedly provided on the bottom of the support frame.

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

[0014] Furthermore, the cleaning mechanism has a water uniformity cavity 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 uniformity cavity, and water outlet holes are evenly arranged on the outside of the water outlet plate cavity.

[0015] Furthermore, sliding rods are vertically fixed on the top of the four corners of the lower support plate, and the sliding rods are slidably connected to the upper support plate. A stop block is fixed on the end of the sliding rod above the upper support plate, and a return spring is installed 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 door frame fixedly arranged on the top of the dehumidification box, a lead screw connected to the door frame for rotation is arranged inside the door frame in the vertical direction, a lifting drive motor for driving the lead screw to rotate is arranged on the door frame, a lifting plate is threadedly connected to the lead screw, and sliding rods are fixedly arranged 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, and the top of the dewatering mechanism is fixedly connected to the bottom end of the sliding rod.

[0017] Furthermore, the air supply tube inside the dehumidification box has external connecting ports in a circular array, the air inlet tube is provided with an internal connecting port that cooperates with the external connecting port, and the dehumidification box is provided with a rotating drive mechanism; the rotating drive mechanism is used to drive the air inlet tube to rotate relative to the air supply tube so that the internal connecting port corresponds to or is staggered with the external connecting port.

[0018] Furthermore, a gear ring is fixedly mounted on the outer side of the air inlet cylinder, a gear is meshed on the gear ring, and a rotary drive motor for driving the gear to rotate is provided on the dehumidification box.

[0019] Furthermore, a dehumidification air valve is provided on the air inlet window.

[0020] Beneficial effects of the present invention:

[0021] (1) The tunnel construction ventilation device of the present invention can switch the connection or cutoff between the air inlet duct and the interior of 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 air supply state is larger than the air inlet area in the direct air supply state. Under the premise that the air supply volume to the tunnel is fixed, the air flow velocity inside the air inlet window in the dehumidification air supply state is lower than the air flow velocity inside the air inlet tube in the direct air supply state, so that the external air has a longer contact time with 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 dehydration mechanism to move outside the dehumidification plate, which can remove the condensed water outside the dehumidification plate and reduce the impact of the condensed water on the condensation efficiency of the dehumidification plate. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 This is the second structural diagram of the tunnel construction ventilation device in the present invention.

[0026] Figure 3 This is the third structural diagram of the tunnel construction ventilation device in the present invention.

[0027] Figure 4 for Figure 3 Cross-section view at AA in the middle.

[0028] Figure 5 It is a structural schematic diagram of the air inlet 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 structural 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 partial enlarged view of point B in the middle.

[0032] Figure 9 for Figure 7 A partial enlarged view of point C in the middle. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention, its application, or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully convey the scope of the present 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 numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0034] The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are simply used to distinguish different parts. Terms such as "include" or "comprising" mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0035] like Figures 1 to 9As shown, the construction ventilation device in the tunnel includes an air supply tube 2, a fan 21 is arranged inside one end of the air supply tube 2, an air inlet tube 1 is rotatably arranged inside the other end of the air supply tube 2, an air inlet valve 11 is arranged on the end of the air inlet tube 1 facing away from the air supply tube 2, a dehumidification box 3 is set on the outside of the air supply tube 2, and the air inlet tube 1 can be connected to or cut off from the inside of the dehumidification box 3; air inlet windows 31 are arranged on both sides of the dehumidification box 3, and an evaporation component 5 and a condenser 6 are arranged in sequence inside the dehumidification box 3 corresponding to the air inlet windows 31; the evaporation component 5 has a support frame 51 corresponding to the air inlet window 31, and dehumidification plates 52 are evenly arranged inside the support frame 51, and the dehumidification plates 52 are arranged inside the support frame 51 in a vertical direction, and the upper ends of the dehumidification plates 52 are fixedly connected to the support frame 51. 2 is provided with an evaporation pipe 53; the outer side of the dehumidification plate 52 is provided with a dewatering mechanism 7 for removing condensed water on its side along the sliding path, and the top of the dehumidification box 3 is provided with a lifting drive mechanism 8 for driving the dewatering mechanism 7 to move up and down; in this embodiment, the end of the air supply cylinder 2 close to the fan 21 is used to connect the air duct, and the fan 21 sends external air into the interior of the tunnel through the air duct. When the humidity of the external air is low, the air inlet cylinder 1 and the dehumidification box 3 are cut off, and the fan 21 directly extracts external air through the air inlet cylinder 1 and sends it into the tunnel. When the humidity of the external air is high, sending it directly into the tunnel may not effectively reduce the internal humidity. At this time, the air inlet cylinder 1 is connected to the interior of the dehumidification box 3, and the refrigeration circuit where the evaporation component 5 and the condenser 6 are located is started. The air inlet valve 11 will The end of the air inlet duct 1 is closed, and the external air passes through the air inlet window 31, the evaporation component 5 and the condenser 6 in sequence and enters the interior of the air inlet duct 1. After a part of the water vapor in the external air is condensed and removed by the evaporation component 5, the dehumidified air is 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 cutoff between the air inlet duct 1 and the inside of the dehumidification box 3 as needed, so that the device has two ventilation modes of direct air supply and dehumidification air supply, which meet the ventilation needs under different external air conditions in tunnel construction and reduce the humidity inside the tunnel; in the dehumidification air supply state, the external air enters the air supply duct 2 through multiple air inlet windows 31, and in the direct air supply state, the external air only enters the air supply duct through the air inlet duct 1 The air duct 2 can make the air intake area in the dehumidification air supply state larger than that in the direct air intake state by increasing the number of air intake windows 31 on both sides of the dehumidification box 3. Under the premise of a fixed air supply volume to the tunnel, the air flow velocity inside the air intake windows 31 in the dehumidification air supply state is lower than the air flow velocity inside the air duct 1 in the direct air intake state, so that the external air has a longer contact time with the dehumidification plate 52, thereby improving the removal effect of water vapor in the air; the accumulation of condensed water on the outside of the dehumidification plate 52 will affect its condensation efficiency. During the operation of the ventilation device for construction in the tunnel, the lifting drive mechanism 8 periodically drives the dehydration mechanism 7 to move outside the dehumidification plate 52, which can remove the condensed water on the outside of the dehumidification plate 52 and reduce the influence of the condensed water on the condensation efficiency of the dehumidification plate 52;The evaporation pipes, condenser 6, expansion valve, and compressor in the evaporation assembly 5 are connected to form a refrigeration circuit. This is prior art and will not be described in detail. A base frame 34 is symmetrically provided at the bottom of the dehumidification box 3 to provide support for the dehumidification box 3. A drain valve 32 is provided on one side of the bottom of the dehumidification box 3 to drain condensed water collected within the dehumidification box 3.

[0036] As a specific implementation of the above-mentioned dewatering mechanism 7, Figure 7 and 8 As shown, the dewatering mechanism 7 has an upper support plate 72 and a lower support plate 71 which are arranged correspondingly in the upper and lower directions. The upper support plate 72 and the lower support plate 71 are both provided with a avoidance opening 721 corresponding to the dehumidification plate 52. An elastic water-absorbing component 73 in contact with the side surface of the dehumidification plate 52 is provided between the upper support plate 72 and the lower support plate 71. When the lifting drive mechanism 8 periodically drives the dewatering mechanism 7 to move on the outside of the dehumidification plate 52, the elastic water-absorbing component 73 can absorb the condensed water on the outside of the dehumidification plate 52 and wipe the outside of the dehumidification plate 52, thereby removing the condensed water on the outside of the dehumidification plate 52 and reducing the influence of the condensed water 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 along the vertical direction, and the middle parts 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 dehumidification plate 52 is fixedly connected to the inside of the support frame 51 through a connecting handle (the connecting handle is not shown in the figure), thereby realizing a fixed connection between the dehumidification plate 52 and the support frame 51. Specifically, at least two connecting handles are symmetrically arranged at the top of the dehumidification plate 52. The connecting handle is a cylindrical structure that is integrated with the top of the dehumidification plate 52. An internal threaded hole is provided at the top of the connecting handle. The upper end of the connecting handle is assembled on the top of the support frame 51 by bolts, thereby realizing the fixation of the dehumidification plate 52 inside the support frame 51.

[0039] In some embodiments, as Figure 9 As shown, the bottom of the support frame 51 is fixedly provided with support columns 78 corresponding to the two sides of the bottom of the lower support plate 71. When the lifting drive mechanism 8 drives the dewatering 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 dewatering mechanism 7 to continue to move, the upper support plate 72 presses down the elastic water-absorbing component 73 to squeeze out the condensed water absorbed inside the elastic water-absorbing component 73, so as to facilitate the absorption and removal of the condensed water on the outside of the dehumidification plate 52 next time.

[0040] In some embodiments, although a primary filter is provided at the air intake window 31 to reduce the dust from entering the interior of the dehumidification box 3, a small amount of dust will inevitably enter. The dust adheres to the outside of the dehumidification plate 52 with the condensed water, and adheres to the elastic water-absorbing component 73 during the process of the dehydration mechanism 7 removing the condensed water; a cleaning mechanism 9 is provided under the dehumidification plate 52, and the cleaning mechanism 9 is used to spray cleaning water onto the elastic water-absorbing component 73; while the cleaning mechanism 9 sprays cleaning water onto the elastic water-absorbing component 73, the lifting drive mechanism 8 drives the dehydration 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-absorbing component 73, removing large particles of dirt such as dust on the outside of the elastic water-absorbing component 73 and dirty water in the internal gaps of the elastic water-absorbing component 73.

[0041] As a specific embodiment of the cleaning mechanism 9, Figure 7 and 9 As shown, the cleaning mechanism 9 has a uniform water chamber 91 symmetrically arranged on both sides of the evaporation pipe 53 at the lower end of the dehumidification plate 52, and a water outlet plate chamber 92 corresponding to the dehumidification plate 52 is fixedly provided on the top of the uniform water chamber 91, and the bottom end of the water outlet plate chamber 92 is connected to the uniform water chamber 91, and water outlet holes are evenly arranged on the outside of the water outlet plate chamber 92 (the water outlet holes are not shown in the figure); the uniform water chamber 91 is connected to a water supply pipeline, and the water supply pipeline is connected to a water pump, and the external clean water source is pumped into the interior of the uniform water chamber 91 by the water pump, and distributed to the water outlet plate chamber 92 through the uniform water chamber 91, and finally sprayed outward from the water outlet hole on the water blowing plate chamber 92 to the outside of the elastic water absorbing component 73, and the elastic water absorbing component 73 is continuously squeezed by the upper support plate 72 to be rinsed.

[0042] In some embodiments, as Figure 7 and 8 When the locking cam 75 is unlocked, the locking cam 76 is unlocked, and the locking cam 76 is unlocked, so that the master and slaves can lock each other and the master and slaves can be locked.

[0043] In some embodiments, as Figure 7As shown, the lifting drive mechanism 8 has a door frame 82 fixedly arranged on the top of the dehumidification box 3, and a lead screw 85 connected to it for rotation is arranged inside the door frame 82 in the vertical direction. A lifting drive motor 86 for driving the lead screw 85 to rotate is arranged on the door frame 82, and a lifting plate 84 is threadedly connected to the lead screw 85. The bottom of both ends of the lifting plate 84 are fixedly provided with a sliding rod 83, which is slidably connected to the top of the dehumidification box 3 and the top of the support frame 51, and the top of the dewatering mechanism 7 is fixedly connected to the bottom end of the sliding rod 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 can drive the lifting plate 8 4 drives the sliding rod 83 to move up and down, and then drives the water removal mechanism 7 to move through the sliding rod 83, so as to drive the water removal mechanism 7 to move along the dehumidification plate 52, remove the condensed water on the outside of the dehumidification plate 52, and continuously squeeze the water removal mechanism 7 to clean the elastic water absorption component 73; wherein 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 according to demand; the bottom of the door frame 82 is fixedly provided with a mounting base 81, the bottom end of the lead screw 85 is rotatably connected to the mounting base 81, and the mounting base 81 is fixedly assembled on the top of the dehumidification box 3.

[0044] In some embodiments, as Figure 3 and 4 As shown, the air supply duct 2 inside the dehumidification box 3 is provided with external connecting ports 22 in a circular array, and the air inlet duct 1 is provided with an internal connecting port 12 that matches the external connecting port 22, and the dehumidification box 3 is provided with a rotating drive mechanism 4 that drives the air inlet duct 1 to rotate relative to the air supply duct 2; the rotating drive mechanism 4 is used to drive the air inlet duct 1 to rotate relative to the air supply duct 2 so that the internal connecting port 12 corresponds to or is misaligned with the external connecting port 22; when the internal connecting port 12 corresponds to the external connecting port 22, the air inlet duct 1 can be connected to the interior of the dehumidification box 3; when the internal connecting port 12 is misaligned with the external 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 is provided with four external connecting ports 22 in a circular array, and the corresponding air inlet duct 1 has four internal connecting ports 12 in a circular array, and the rotating 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, as Figure 3 and 5 As shown, a gear ring 43 is fixedly mounted on the outer side of the air inlet tube 1, a gear 42 is meshed on the gear ring 43, and a rotary drive motor 41 is provided on the dehumidification box 3 to drive the gear 42 to rotate; wherein the rotary drive motor 41 adopts a reduction servo motor, which has a higher angle control accuracy and can output a larger torque.

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

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

[0048] Thus far, various embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details well known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0049] The above-described embodiments represent only some embodiments of the present invention. Although the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be based on the appended claims.

Claims

1. A tunnel construction ventilation device, characterized by: The invention comprises an air supply cylinder, wherein a fan is provided inside one end of the air supply cylinder, an air inlet cylinder is rotatably provided inside the other end of the air supply cylinder, an air inlet valve is provided on the end of the air inlet cylinder facing away from the air supply cylinder, a dehumidification box is sheathed on the outside of the air supply cylinder, and the air inlet cylinder can be connected to or cut off from the dehumidification box; Air inlet windows are provided on both sides of the dehumidification box, and an evaporation component and a condenser are sequentially provided inside the dehumidification box corresponding to the air inlet windows; The evaporation component has a support frame corresponding to the air inlet window, dehumidification plates are evenly arranged inside the support frame, and evaporation pipes are arranged inside the dehumidification plates; The outer side of the dehumidification plate is provided with a dewatering mechanism for removing condensed water on its side surface, and the top of the dehumidification box is provided with a lifting driving mechanism for driving the dewatering mechanism to move up and down.

2. The tunnel construction ventilation device according to claim 1, characterized in that: The dewatering mechanism comprises an upper supporting plate and a lower supporting plate which are arranged correspondingly up and down. An elastic water absorbing component which contacts the side surface of the dehumidifying plate is arranged between the upper supporting plate and the lower supporting plate.

3. The tunnel construction ventilation device according to claim 2, characterized in that: The bottom of the support frame is fixedly provided with support columns corresponding to both sides of the bottom of the lower support plate.

4. The tunnel construction ventilation device according to claim 3, characterized in that: A cleaning mechanism is provided below the dehumidifying plate, and the cleaning mechanism is used for spraying cleaning water onto the elastic water absorbing component.

5. The tunnel construction ventilation device according to claim 4, characterized in that: The cleaning mechanism has a water uniformity cavity symmetrically arranged on both sides of the evaporation pipe at the lower end of the dehumidification plate, a water outlet plate cavity corresponding to the dehumidification plate is fixedly arranged on the top of the water uniformity cavity, and water outlet holes are evenly arranged on the outside of the water outlet plate cavity.

6. The tunnel construction ventilation device according to claim 2, characterized in that: Slide rods are vertically fixed on the top of the four corners of the lower support plate, and the slide rods are slidably connected to the upper support plate. A stop block is fixed on the end of the slide rod above the upper support plate, and a return spring is sleeved on the outer side of the slide rod between the upper support plate and the lower support plate.

7. The tunnel construction ventilation device according to claim 1, characterized in that: The lifting drive mechanism has a door frame fixedly arranged on the top of the dehumidification box, a lead screw rotatably connected to the door frame is arranged inside the door frame in the vertical direction, a lifting drive motor for driving the lead screw to rotate is arranged on the door frame, a lifting plate is threadedly connected to the lead screw, and sliding rods are fixedly arranged on 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, and the top of the dewatering mechanism is fixedly connected to the bottom end of the sliding rod.

8. The tunnel construction ventilation device according to claim 1, characterized in that: The air supply tube inside the dehumidification box is provided with external connecting ports in a circular array, the air inlet tube is provided with an internal connecting port that matches the external connecting port, and the dehumidification box is provided with a rotating drive mechanism; the rotating drive mechanism is used to drive the air inlet tube to rotate relative to the air supply tube so that the internal connecting port corresponds to or is staggered with the external connecting port.

9. The tunnel construction ventilation device according to claim 8, characterized in that: A gear ring is fixedly sleeved on the outer side of the air inlet cylinder, a gear is meshed on the gear ring, and a rotary drive motor for driving the gear to rotate is provided on the dehumidification box.

10. The tunnel construction ventilation device according to claim 1, characterized in that: A dehumidification air valve is provided on the air inlet window.

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