Tunnel construction dust removal device and method

Abstract

The present invention belongs to the technical field of tunnel construction, and specifically relates to a dust removal device for tunnel construction, comprising a base, a U-shaped frame being provided on the upper side of the base, a mist cannon barrel being installed in the U-shaped frame, the front and rear ends of the mist cannon barrel being open, a blower being installed on the rear side of the mist cannon barrel, and the front and rear ends of the mist cannon barrel being provided with a closing mechanism; when the dust reduction device is not in use, a circular closing plate is formed by a plurality of fan-shaped plates to seal the openings at both ends of the mist cannon barrel, so as to prevent external impurities from entering the interior of the mist cannon barrel, protect the components inside the mist cannon barrel, and extend the service life of the device; when the device is working, the plurality of fan-shaped plates can be automatically opened by water pressure, without the need for manual opening by staff, and the degree of automation is high.

Description

Technical Field

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

[0002] In recent years, tunnel construction has been developing towards larger diameters, more complex strata, and less disturbance, resulting in an increasing number of ultra-large cross-section multifunctional tunnels. However, operations such as drilling and blasting, ballast loading, transportation, concrete mixing and pouring, and shotcrete spraying during tunnel construction all generate large amounts of inorganic dust or slurry mist, posing a significant health hazard to construction workers. Consequently, fog cannons are often used at road construction sites for dust reduction. These cannons consist of a cannon barrel and a base. Based on the principle of air delivery, they first use a high-pressure pump and a fine atomizing nozzle to atomize water and spray it from the barrel. The fan's air volume and pressure then deliver the atomized water mist over long distances, allowing the water mist to reach a greater distance while simultaneously adhering to airborne dust, causing it to settle.

[0003] However, when the fog cannon is not in use, both ends of its fog cannon barrel are open, and external impurities can easily enter the fog cannon barrel, causing damage to the internal components of the fog cannon barrel, and it can also easily cause the atomizing nozzle to be blocked, affecting subsequent use. Summary of the Invention

[0004] The purpose of the present invention is to provide a dust removal device for tunnel construction. When the dust reduction device is not in use, a plurality of fan-shaped plates form a circular sealing plate to seal the openings at both ends of the fog cannon barrel, thereby preventing external impurities from entering the interior of the fog cannon barrel, protecting the components inside the fog cannon barrel, and extending the service life of the device. When the device is working, the plurality of fan-shaped plates can be automatically opened by water pressure without the need for manual opening by staff, and the degree of automation is high.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0006] A tunnel construction dust removal device comprises a base, a U-shaped frame is provided on the upper side of the base, a fog cannon barrel is installed in the U-shaped frame, the front and rear ends of the fog cannon barrel are open, a blower is installed on the rear side of the fog cannon barrel, and the front and rear ends of the fog cannon barrel are both provided with a sealing mechanism;

[0007] The closing mechanism includes a plurality of evenly distributed mounting grooves provided at the end of the mist cannon barrel, a plurality of rotating shafts are rotatably mounted in the plurality of mounting grooves, a plurality of connecting plates are fixed to the rotating shafts, a plurality of fan-shaped plates are fixed to the ends of the connecting plates, and a plurality of fan-shaped plates together constitute a circular sealing plate, the circular sealing plate matches the opening of the mist cannon barrel, a gear is fixed to one end of the rotating shaft, the mist cannon barrel is provided with a slide groove, and a rack meshing with the gear is slidably mounted in the slide groove;

[0008] A spray mechanism is provided on the front side of the mist cannon barrel, and the spray mechanism includes an annular groove opened on the inner wall of the mist cannon barrel, a connector is installed on the lower side of the mist cannon barrel, the connector is communicated with the annular groove, an annular plate is sealingly and slidingly assembled in the annular groove, a pushing assembly is provided between the annular plate and several of the racks, the annular groove is provided with several water outlets located on the front side of the annular plate, and several of the water outlets are connected to water outlet pipes, an annular nozzle is installed at the front end of the mist cannon barrel, and several of the water outlet pipes are connected to the annular nozzle.

[0009] The pushing assembly includes a tank body fixed to the front side of the annular groove, a piston plate is sealingly and slidingly assembled in the tank body, the rear end of the piston plate is connected to a push rod, the push rod slides out of the tank body and is connected to the annular plate, the front side wall of the fog cannon barrel is opened with a first cavity, the first cavity is located below the slide groove on the front side, the first cavity and the tank body are connected through an oil channel, the first sealing plate is sealingly and slidingly assembled in the first cavity, the tank body, the first cavity and the oil channel are all filled with hydraulic oil, the first sealing plate is connected to a first connecting rod, one end of the first connecting rod extends into the slide groove on the front side and is connected to the rack, a first spring is provided between the front side of the first sealing plate and the first cavity, and a connecting pushing member is provided between the rack on the rear side and the first cavity.

[0010] The connecting pusher includes a second cavity provided on the rear side wall of the fog cannon barrel, the second cavity is located below the slide groove on the rear side, a second sealing plate is sealingly and slidingly assembled in the second cavity, the second sealing plate is connected to a second connecting rod, one end of the second connecting rod extends into the slide groove on the rear side and is connected to the rack, a second spring is provided between the second cavity on the rear side of the second sealing plate, and the second cavity is connected to the front side of the first cavity through an oil pipe.

[0011] A disc is rotatably mounted on the upper side of the base, the U-shaped frame is mounted on the upper side of the disc, a driving motor is mounted in the base, and an output shaft of the driving motor is drivingly connected to the disc.

[0012] A rotating block is fixed at both ends of the left and right ends of the fog cannon barrel, and the rotating block is rotatably connected to the U-shaped frame. A first hinge seat is fixed on the upper side of the disc, and the first hinge seat is hinged to a hydraulic cylinder. A second hinge seat is provided on the lower side of the fog cannon barrel, and the output shaft of the hydraulic cylinder is hinged to the second hinge seat.

[0013] A water pump is installed inside the base, the water outlet of the water pump is connected to a hose, the other end of the hose is connected to the connector, and the water inlet of the water pump is connected to an external water source through a water pipe.

[0014] Four universal wheels distributed in a rectangular shape are installed at the bottom of the base.

[0015] When the dust reduction device of the present invention is not in use, a plurality of fan-shaped plates form a circular sealing plate to seal the openings at both ends of the fog cannon barrel, thereby preventing external impurities from entering the interior of the fog cannon barrel, protecting the components inside the fog cannon barrel, and extending the service life of the device. When the device is working, the plurality of fan-shaped plates can be automatically opened by water pressure without the need for manual opening by staff, and the degree of automation is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further illustrated by means of the following non-limiting examples.

[0017] Figure 1 This is a schematic structural diagram of an embodiment of a tunnel construction dust removal device according to the present invention;

[0018] Figure 2 This is a schematic cross-sectional view of an embodiment of a tunnel construction dust removal device according to the present invention;

[0019] Figure 3 The cross-sectional structure of the fog cannon barrel of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 4 for Figure 3 A schematic diagram of the structure at center A;

[0021] Figure 5 for Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0022] Figure 6 The cross-sectional structure of the fog cannon barrel of the present invention is shown in FIG. Figure 2 ;

[0023] Figure 7 for Figure 6 A magnified schematic diagram of the structure at C in the middle;

[0024] Figure 8 for Figure 6 A schematic diagram of the structure at D in the middle;

[0025] Figure 9 This is a structural schematic diagram of an embodiment of a tunnel construction dust removal device of the present invention in a working state.

[0026] The main component symbols are described as follows:

[0027] Base 1, U-shaped frame 11, fog cannon barrel 12, blower 13, disc 14, drive motor 15, first hinge seat 16, hydraulic cylinder 17, second hinge seat 171, water pump 18, hose 181, universal wheel 19, mounting groove 2, rotating shaft 21, connecting plate 22, fan-shaped plate 23, gear 24, slide 25, rack 26, annular groove 3, connector 301, annular plate 31, water outlet 32, water outlet pipe 33, annular nozzle 34, tank body 4, piston plate 41, push rod 42, first cavity 43, oil channel 44, first sealing plate 45, first connecting rod 451, first spring 46, second cavity 5, second sealing plate 51, second connecting rod 52, second spring 53, oil pipe 54. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0029] like Figure 1-9 As shown, a tunnel construction dust removal device of the present invention includes a base 1, a U-shaped frame 11 is provided on the upper side of the base 1, a fog cannon barrel 12 is installed in the U-shaped frame 11, the front and rear ends of the fog cannon barrel 12 are open, a blower 13 is installed on the rear side of the fog cannon barrel 12, and the front and rear ends of the fog cannon barrel 12 are both provided with a closing mechanism;

[0030] The closing mechanism includes a plurality of evenly distributed mounting grooves 2 provided at the end of the mist cannon barrel 12, a plurality of mounting grooves 2 are rotatably fitted with rotating shafts 21, a plurality of rotating shafts 21 are fixed with connecting plates 22, a plurality of connecting plates 22 are fixed with fan-shaped plates 23 at the ends, and a plurality of fan-shaped plates 23 together constitute a circular sealing plate, which matches the opening of the mist cannon barrel 12, a gear 24 is fixed at one end of the rotating shaft 21, and the mist cannon barrel 12 is provided with a slide groove 25, and a rack 26 meshing with the gear 24 is slidably fitted in the slide groove 25;

[0031] A spray mechanism is provided on the front side of the mist cannon barrel 12, and the spray mechanism includes an annular groove 3 opened on the inner wall of the mist cannon barrel 12. A connector 301 is installed on the lower side of the mist cannon barrel 12, and the connector 301 is connected to the annular groove 3. An annular plate 31 is sealingly and slidingly assembled in the annular groove 3, and a pushing assembly is provided between the annular plate 31 and several racks 26. The annular groove 3 is provided with several water outlets 32 located on the front side of the annular plate 31, and several water outlets 32 are connected to water outlet pipes 33. An annular nozzle 34 is installed at the front end of the mist cannon barrel 12, and several water outlet pipes 33 are connected to the annular nozzle 34.

[0032] When the device is not in use, several sector plates 23 together form a circular sealing plate to seal the front and rear ends of the mist cannon barrel 12, preventing foreign matter from entering the interior of the mist cannon barrel 12 when the device is not in use for a long time. This can protect the internal device of the mist cannon barrel 12 and extend the service life of the device. At this time, the annular plate 31 is located at the rear side of the water outlet 32. The clean water entering the annular plate 31 needs to push the annular plate 31 forward before it can be discharged from the water outlet 32.

[0033] When the device is in use, it is placed at the tunnel construction site and connected to an external power source. The device is connected to the external water source through a water pipe and a connector 301. When dust is suppressed, the clean water is pressurized and transported to the inside of the annular groove 3 through the connector 301. After the clean water enters the annular groove 3, it will push the annular plate 31 to move forward, and the annular plate 31 will drive the rack 26 to move through the pushing component. Since the rack 26 is engaged with the gear 24 connected to the rotating shaft 21, the movement of the rack 26 can drive the rotating shaft 21 to rotate through the gear 24, and then drive the fan-shaped plate 23 to flip outward until the annular plate 31 moves forward to the front side of the water outlet 32. The clean water inside the annular groove 3 will enter the annular nozzle 34 through the water outlet pipe 33 and finally be sprayed out by a number of atomizing nozzles provided on the annular nozzle 34. At the same time, the device starts the blower 13 on the rear side of the fog cannon barrel 12 to generate airflow. The water mist is sprayed forward under the action of the airflow, with a wide coverage area, which can effectively suppress dust on the construction site.

[0034] Such a design can automatically drive the plurality of sector plates 23 to flip by water pressure when the device is working, so that the two ends of the mist cannon barrel 12 are opened. When the device is not in use, the annular plate 31 is pushed back by the pushing assembly, that is, the plurality of sector plates 23 will close to form a circular sealing plate to block the opening of the mist cannon barrel 12, thereby preventing foreign matter from entering the mist cannon barrel 12 and preventing foreign matter from adhering to the atomizing nozzle of the annular nozzle 34, thereby preventing the atomizing nozzle from being blocked.

[0035] When the dust reduction device of the present invention is not in use, a plurality of fan-shaped plates form a circular sealing plate to seal the openings at both ends of the fog cannon barrel, thereby preventing external impurities from entering the interior of the fog cannon barrel, protecting the components inside the fog cannon barrel, and extending the service life of the device. When the device is working, the plurality of fan-shaped plates can be automatically opened by water pressure without the need for manual opening by staff, and the degree of automation is high.

[0036] The pushing assembly includes a tank body 4 fixed to the front end of the annular groove 3, and a piston plate 41 is sealingly and slidingly assembled in the tank body 4, and a push rod 42 is connected to the rear end of the piston plate 41. The push rod 42 slides out of the tank body 4 and is connected to the annular plate 31. A first cavity 43 is opened on the front side wall of the fog cannon barrel 12, and the first cavity 43 is located below the front side slide groove 25. The first cavity 43 and the tank body 4 are connected through an oil passage 44. A first sealing plate 45 is sealingly and slidingly assembled in the first cavity 43. The tank body 4, the first cavity 43 and the oil passage 44 are all filled with hydraulic oil. The first sealing plate 45 is connected to a first connecting rod 451. One end of the first connecting rod 451 extends into the front side slide groove 25 and is connected to the rack 26. A first spring 46 is provided between the front side of the first sealing plate 45 and the first cavity 43, and a connecting pusher is provided between the rear rack 26 and the first cavity 43;

[0037] The connecting pusher includes a second cavity 5 formed on the rear side wall of the fog cannon barrel 12. The second cavity 5 is located below the rear chute 25. A second sealing plate 51 is slidingly and sealingly assembled in the second cavity 5. The second sealing plate 51 is connected to a second connecting rod 52. One end of the second connecting rod 52 extends into the rear chute 25 and is connected to the rack 26. A second spring 53 is provided between the second cavity 5 and the rear side of the second sealing plate 51. The second cavity 5 is connected to the front side of the first cavity 43 through an oil pipe 54.

[0038] When the clean water enters the annular groove 3 and pushes the annular plate 31 to move forward, the annular plate 31 will push the piston plate 41 in the tank body 4 to move forward through the push rod 42, and then push the hydraulic oil in the tank body 4 into the first cavity 43 through the oil channel 44, and then the first sealing plate 45 in the first cavity 43 will move forward, and push the rack 26 in the front side slide groove 25 to slide through the first connecting rod 451, and the rack 26 connected to the rotating shaft 21 and the gear 24 are meshed with each other, that is, the rotating shaft 21 rotates to drive the sector plate 23 to flip outward, so that if The dry sector plate 23 will flip outward to open the opening of the fog cannon barrel 12, and after the hydraulic oil enters the first cavity 43, if the first sealing plate 45 moves forward to the maximum stroke, the excess hydraulic oil will enter the second cavity 5 through the oil pipe 54, pushing the second sealing plate 51 in the second cavity 5 to move backward, and the rack 26 in the rear slide 25 can be driven by the second connecting rod 52 to move backward, thereby causing the rear shaft 21 to rotate, that is, the several sector plates 23 on the rear side will also flip outward to open the rear end opening of the fog cannon barrel 12.

[0039] With this design, when the water pressure inside the annular groove 3 increases and drives the annular plate 31 to move forward, the fan-shaped plates 23 at the front and rear ends of the fog cannon barrel 12 can be turned outward at the same time, that is, the openings at the front and rear ends of the fog cannon barrel 12 can be opened at the same time, which is convenient for dust reduction work.

[0040] When the device is not in use, clean water is no longer injected into the annular groove 3. The first sealing plate 45 and the second sealing plate 51 can be pushed back to their original position by the elastic force of the first spring 46 and the second spring 53, so that the hydraulic oil can be pushed back into the tank body 4, thereby driving the annular plate 31 to reset, that is, the several sector plates 23 re-block the opening of the fog cannon barrel 12. The opening of the fog cannon barrel 12 can be automatically blocked without manual operation.

[0041] A disc 14 is rotatably mounted on the upper side of the base 1, and a U-shaped frame 11 is installed on the upper side of the disc 14. A drive motor 15 is installed in the base 1, and the output shaft of the drive motor 15 is transmission-connected to the disc 14. In this way, the drive motor 15 can be started to drive the disc 14 to rotate, and then the fog cannon barrel 12 can be driven to rotate horizontally as a whole, which can adapt to different scenarios and increase the dust reduction range.

[0042] A rotating block is fixed on both ends of the fog cannon barrel 12, and the rotating block is rotatably connected to the U-shaped frame 11. A first hinge seat 16 is fixed on the upper side of the disc 14, and the first hinge seat 16 is hinged to the hydraulic cylinder 17. A second hinge seat 171 is provided on the lower side of the fog cannon barrel 12, and the output shaft of the hydraulic cylinder 17 is hinged to the second hinge seat 171; in this way, by starting the hydraulic cylinder 17, the output shaft of the hydraulic cylinder 17 can be extended and retracted, and then the fog cannon barrel 12 can be driven to rotate with the rotating block as the center of the circle, and the spraying angle of the fog cannon barrel 12 can be adjusted to reduce dust on the construction site according to actual needs.

[0043] A water pump 18 is installed inside the base 1, and the water outlet end of the water pump 18 is connected to a hose 181, the other end of the hose 181 is connected to the connector 301, and the water inlet end of the water pump 18 is connected to an external water source through a water pipe; in this way, it is only necessary to connect the water pipe to the external water source and start the water pump 18 to pressurize the clean water and transport it through the hose 181 to the annular groove 3, and finally spray it out from the several atomizing nozzles of the annular nozzle 34.

[0044] Four universal wheels 19 distributed in a rectangular shape are installed at the bottom of the base 1; the device can be moved by the universal wheels 19, so that the device can be moved to a designated location for dust reduction treatment.

[0045] In order to facilitate the inspection and maintenance of the inside of the fog cannon barrel 12, the staff can use tools to move the rack 26, so that several sector plates 23 are flipped outward a short distance, and then they can directly hold the sector plates 23 with their hands and flip them outward. A pin hole can be set on the upper rack 26. After flipping the sector plates 23, the pin can be inserted into the pin hole for temporary fixation, which makes it convenient for the staff to inspect the components inside the fog cannon barrel 12.

[0046] A method for using a tunnel construction dust removal device comprises the following steps:

[0047] S1: Move the device to the tunnel construction site and connect it to an external water source;

[0048] S2: Adjust the horizontal angle of the fog cannon barrel 12 by starting the drive motor 15 and driving the hydraulic cylinder 17 to adjust the tilt angle of the fog cannon barrel 12;

[0049] S3: After the angle adjustment is completed, the water pump 18 and the blower 13 are started to pump clean water into the annular groove, pushing the annular plate 31 forward, thereby causing the plurality of sector plates 23 to flip outward. Finally, the clean water is sprayed out through the plurality of atomizing nozzles of the annular nozzle 34. The water mist is sprayed forward under the action of the airflow, achieving the effect of dust reduction.

[0050] S4: When performing large-scale dust suppression, the drive motor 15 can be started to drive the mist cannon barrel 12 to swing back and forth to increase the spraying range of the water mist;

[0051] S5: After the device is used, turn off the water pump 18 and the blower 13, and the annular plate 31 in the annular groove 3 will automatically reset, driving the several fan-shaped plates 23 to flip and reset, automatically closing both ends of the fog cannon barrel 12 to protect the components inside the fog cannon barrel 12.

[0052] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A tunnel construction dust removal device, comprising a base, characterized in that: A U-shaped frame is provided on the upper side of the base, a fog cannon barrel is installed in the U-shaped frame, the front and rear ends of the fog cannon barrel are open, a blower is installed on the rear side of the fog cannon barrel, and the front and rear ends of the fog cannon barrel are provided with a closing mechanism; The closing mechanism includes a plurality of evenly distributed mounting grooves provided at the end of the mist cannon barrel, a plurality of rotating shafts are rotatably mounted in the plurality of mounting grooves, a plurality of connecting plates are fixed to the rotating shafts, a plurality of fan-shaped plates are fixed to the ends of the connecting plates, and a plurality of fan-shaped plates together constitute a circular sealing plate, the circular sealing plate matches the opening of the mist cannon barrel, a gear is fixed to one end of the rotating shaft, the mist cannon barrel is provided with a slide groove, and a rack meshing with the gear is slidably mounted in the slide groove; The front side of the mist cannon barrel is provided with a spray mechanism, and the spray mechanism includes an annular groove provided on the inner wall of the mist cannon barrel, a connector is installed on the lower side of the mist cannon barrel, the connector is communicated with the annular groove, an annular plate is sealingly and slidingly assembled in the annular groove, a pushing assembly is provided between the annular plate and the plurality of racks, the annular groove is provided with a plurality of water outlets located on the front side of the annular plate, and the plurality of water outlets are connected to water outlet pipes, an annular nozzle is installed at the front end of the mist cannon barrel, and the plurality of water outlet pipes are connected to the annular nozzle; The pushing assembly includes a tank body fixed to the front side of the annular groove, a piston plate is sealingly and slidably assembled in the tank body, and the rear end of the piston plate is connected to a push rod, and the push rod slides out of the tank body and is connected to the annular plate, and a first cavity is opened on the front side wall of the fog cannon barrel, the first cavity is located below the slide groove on the front side, the first cavity and the tank body are connected through an oil channel, a first sealing plate is sealingly and slidably assembled in the first cavity, and the tank body, the first cavity and the oil channel are all filled with hydraulic oil, the first sealing plate is connected to a first connecting rod, one end of the first connecting rod extends into the slide groove on the front side and is connected to the rack, a first spring is provided between the front side of the first sealing plate and the first cavity, and a connecting pusher is provided between the rack on the rear side and the first cavity; The connecting pusher includes a second cavity provided on the rear side wall of the fog cannon barrel, the second cavity is located below the slide groove on the rear side, a second sealing plate is sealingly and slidingly assembled in the second cavity, the second sealing plate is connected to a second connecting rod, one end of the second connecting rod extends into the slide groove on the rear side and is connected to the rack, a second spring is provided between the second cavity on the rear side of the second sealing plate, and the second cavity is connected to the front side of the first cavity through an oil pipe.

2. A tunnel construction dust removal device according to claim 1, characterized in that: A disc is rotatably mounted on the upper side of the base, the U-shaped frame is mounted on the upper side of the disc, a driving motor is mounted in the base, and an output shaft of the driving motor is drivingly connected to the disc.

3. A tunnel construction dust removal device according to claim 2, characterized in that: A rotating block is fixed at both ends of the left and right ends of the fog cannon barrel, and the rotating block is rotatably connected to the U-shaped frame. A first hinge seat is fixed on the upper side of the disc, and the first hinge seat is hinged to a hydraulic cylinder. A second hinge seat is provided on the lower side of the fog cannon barrel, and the output shaft of the hydraulic cylinder is hinged to the second hinge seat.

4. The tunnel construction dust removal device according to claim 1, characterized in that: A water pump is installed inside the base, the water outlet of the water pump is connected to a hose, the other end of the hose is connected to the connector, and the water inlet of the water pump is connected to an external water source through a water pipe.

5. The tunnel construction dust removal device according to claim 1, characterized in that: Four universal wheels distributed in a rectangular shape are installed at the bottom of the base.

6. A method for using a tunnel construction dust removal device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Move the device to the tunnel construction site and connect it to an external water source; S2: Start the drive motor to adjust the horizontal angle of the fog cannon barrel and drive the hydraulic cylinder to adjust the tilt angle of the fog cannon barrel; S3: After the angle is adjusted, the water pump and blower are started to pump clean water into the annular groove, pushing the annular plate forward, thereby causing several fan-shaped plates to flip outward. Finally, clean water is sprayed out through several atomizing nozzles of the annular nozzle. The water mist is sprayed forward under the action of the airflow, achieving the effect of dust reduction. S4: When performing large-scale dust suppression, the drive motor can be started to drive the mist cannon barrel to swing back and forth to increase the spraying range of the water mist; S5: After the device is used, turn off the water pump and blower, the annular plate in the annular groove will automatically reset, driving several fan-shaped plates to flip and reset, automatically closing both ends of the fog cannon barrel to protect the components inside the fog cannon barrel.

Images