A ventilation duct support device

Abstract

The present application relates to the technical fields of pipeline reinforcing, in particular to a ventilation pipeline supporting device, which comprises a fixed plate and a sliding rod fixed on a wall, a sliding groove is formed in the side wall of the fixed plate, two sliding rods are fixedly connected to the inner side walls of the sliding groove at both ends respectively, two protrusions are slidingly connected to the ends of the two sliding rods respectively, a ventilation pipeline body is fixedly connected to each of the two protrusions, and a protection mechanism is arranged on the protrusion, the inner tube and the outer tube form a closed space, the first piston plate reciprocates to remove the air in the closed space, the outside of the pipeline connection is kept close to vacuum, the shock wave generated by the daily blasting of the coal mine is absorbed through the cooperation of the air bag and the buffer spring, the hard connection between the pipelines is avoided to prevent the connection from being damaged, the external gas is prevented from corroding the connection, the harmful gas is also prevented from entering the pipeline from the connection, and the physical health and safety of the staff are ensured.

Description

Technical Field

[0001] This invention relates to the field of pipeline reinforcement technology, and in particular to a ventilation duct support device. Background Technology

[0003] During coal mining, blasting operations are carried out daily, generating significant vibrations that can easily damage the connections of ventilation ducts. Furthermore, the presence of corrosive gases underground in coal mines can further corrode and damage these connections, leading to gas leaks. Harmful gases, such as methane, can easily enter the ducts through the damaged areas, harming the health of the workers. Summary of the Invention

[0004] The purpose of this invention is to address the following shortcomings in the prior art: during the mining process in coal mines, blasting operations are carried out every day, generating significant vibrations that can easily damage the connections of ventilation ducts. Furthermore, there are many corrosive gases underground in coal mines, which can easily corrode and damage the pipe connections, causing gas leaks. Harmful gases such as methane can easily enter the pipes through the damaged areas, harming the health of the workers. Therefore, this invention proposes a ventilation duct support device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A ventilation duct support device includes a fixing plate and sliding rods fixed to a wall. The side wall of the fixing plate is provided with a sliding groove. Two sliding rods are respectively fixedly connected to the two ends of the inner side wall of the sliding groove. The two ends of the two sliding rods are respectively slidably connected to protrusions. A ventilation duct body is fixedly connected to the two protrusions respectively. The protrusion is provided with a protective mechanism, which includes an inner tube, an outer tube, a first air cylinder, a first piston plate, and a first push rod. The inner tube and the outer tube are respectively fixedly connected to the side walls of the two protrusions that are close to each other, and the inner tube and the outer tube are slidably connected. The two first air cylinders are respectively fixedly connected to the opposite ends of the two protrusions. The first piston plate is slidably connected to the inner side wall of the first air cylinder. The first push rod is fixedly connected to the side wall of the first piston plate and is slidably connected to one side wall of the first air cylinder. The protrusion is also provided with a buffer mechanism, which includes an airbag and a buffer spring. The two airbags are respectively fixedly connected to both ends of the inner sidewall of the fixed plate. The airbags are fixedly connected to the protrusion, and the two buffer springs are respectively fixedly connected between the protrusion and the fixed plate.

[0006] Preferably, the buffer mechanism further includes a second air cylinder, a second piston plate, a second push rod, and a push plate. The two second air cylinders are respectively fixedly connected to the opposite ends of the two protrusions. The second piston plate is slidably connected to the inner side wall of the second air cylinder. The second push rod is fixedly connected to the side wall of the second piston plate. The second push rod is slidably connected to one side wall of the second air cylinder. The push plate is fixedly connected to the end of the second push rod away from the second piston plate.

[0007] Preferably, a fixing ring is fixedly connected to the inner wall of the ventilation duct body, a worm gear is rotatably connected inside the fixing ring, a fan blade is fixedly connected to one end of the worm gear, a rotating shaft is rotatably connected to the inner wall of the ventilation duct body, a worm wheel is fixedly connected to the outer surface of the rotating shaft, and the worm wheel meshes with the worm gear.

[0008] Preferably, a limiting rod is fixedly connected to the upper end face of the ventilation pipe body, a limiting block is fixedly connected to the upper end face of the limiting rod, a reciprocating screw is rotatably connected to the lower end face of the limiting block, a connecting plate is threaded onto the reciprocating screw, and the connecting plate is slidably connected to the limiting rod.

[0009] Preferably, two adjusting rods are fixedly connected to one end of the protrusion near the second air cylinder, and adjusting plates are slidably connected to the two adjusting rods.

[0010] Preferably, a wedge block is fixedly connected to both the end of the adjusting plate away from the second air cylinder and the end of the first push rod away from the first piston plate, and a wedge seat is fixedly connected to both ends of the connecting plate near the wedge block, and the wedge block and the wedge seat are slidably connected.

[0011] Preferably, the two ventilation pipe bodies are fixedly connected to an elastic tube, and the lower end of the reciprocating screw and the upper end of the rotating shaft are both fixedly connected to a magnetic coupler.

[0012] Preferably, an air inlet pipe is fixedly connected between the first air cylinder and the outer tube, an air outlet pipe is fixedly connected to the side wall of the first air cylinder, an air inlet pipe is fixedly connected between the second air cylinder and the air bag, and an exhaust pipe is fixedly connected to the side wall of the second air cylinder. A one-way valve is provided in each of the air inlet pipe, air outlet pipe, air inlet pipe, and exhaust pipe.

[0013] Preferably, a return spring is fixedly connected between the first air cylinder and one of the wedge blocks near the first push rod, an adjustment spring is fixedly connected between the adjustment plate and the push plate, and a compression spring is fixedly connected between the push plate and the second air cylinder.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The inner and outer pipes form a sealed space. The reciprocating motion of the first piston plate draws out the air from the sealed space, keeping the outside of the pipe connection close to a vacuum. This prevents external gases from corroding the connection and also prevents harmful gases from entering the pipe from the connection, thus ensuring the health and safety of the staff.

[0015] 2. The pipeline is flexibly connected by protrusions and elastic tubes, and then the shock waves generated by daily blasting in coal mines are absorbed by the cooperation of airbags and buffer springs, avoiding damage to the connection points caused by hard connections between pipelines and ensuring the health of the workers.

[0016] 3. By using fan blades to drive the worm gear, which in turn drives the reciprocating screw to operate the air cylinder, the airflow within the pipeline itself is used as an energy source, eliminating the need for additional energy supply. This is highly energy-efficient, environmentally friendly, and resource-saving.

[0017] 4. Through the cooperation of the adjusting plate and the return spring, the position of the wedge block is automatically adjusted so that the airbag is always inflated and will not rupture, and the sealed space is kept close to a vacuum, which ensures the shock absorption and sealing effect, and ensures the safety of personnel. No manual operation is required, saving time and effort. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the inner pipe structure of a ventilation duct support device proposed in this invention; Figure 2 This is a schematic diagram of the airbag structure of a ventilation duct support device proposed in this invention; Figure 3 This is a schematic diagram of the outer pipe structure of a ventilation duct support device proposed in this invention; Figure 4 This is a schematic diagram of the first air cylinder structure of a ventilation duct support device proposed in this invention; Figure 5 This is a schematic diagram of the worm gear structure of a ventilation duct support device proposed in this invention; Figure 6 This is a schematic diagram of the first piston plate structure of a ventilation duct support device proposed in this invention. Figure 7 This is a schematic diagram of the push plate structure of a ventilation duct support device proposed in this invention.

[0019] In the diagram: 1. Fixed plate, 2. Slide rod, 3. Protrusion, 4. Ventilation pipe body, 5. Inner pipe, 6. Outer pipe, 7. First air cylinder, 8. First piston plate, 9. First push rod, 10. Airbag, 11. Buffer spring, 12. Second air cylinder, 13. Second piston plate, 14. Second push rod, 15. Push plate, 16. Worm gear, 17. Fan blade, 18. Rotating shaft, 19. Worm wheel, 20. Limiting rod, 21. Limiting block, 22. Reciprocating screw, 23. Connecting plate, 24. Adjusting rod, 25. Adjusting plate, 26. Wedge block, 27. Wedge seat, 28. Elastic tube, 29. Magnetic coupler, 30. Inlet pipe, 31. Outlet pipe, 32. Inlet pipe, 33. Exhaust pipe, 34. Return spring, 35. Adjusting spring, 36. Compression spring, 37. Fixed ring. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Reference Figures 1-7 A ventilation duct support device includes a fixing plate 1 and a sliding rod 2 fixed to a wall. The side wall of the fixing plate 1 has a sliding groove. Two sliding rods 2 are fixedly connected to the two ends of the inner side wall of the sliding groove. The two ends of the two sliding rods 2 are slidably connected to protrusions 3. Ventilation duct bodies 4 are fixedly connected to the two protrusions 3. The protrusions 3 drive the two ventilation duct bodies 4 to slide on the sliding rods 2, avoiding hard contact between the ventilation duct bodies 4 which can easily cause damage. The two ventilation duct bodies 4 are fixedly connected to an elastic tube 28. The elastic tube 28 is made of flexible composite materials such as canvas and rubber, and has properties such as extensibility, corrosion resistance and explosion resistance. The ventilation duct bodies 4 are reinforced at the connection by means of reinforcing ribs to avoid deformation caused by pressure difference due to external vacuum.

[0022] A protective mechanism is provided on the protrusion 3. The protective mechanism includes an inner tube 5, an outer tube 6, a first air cylinder 7, a first piston plate 8, and a first push rod 9. The inner tube 5 and the outer tube 6 are respectively fixedly connected to the side walls of the two protrusions 3 that are close to each other. The inner tube 5 and the outer tube 6 are sealed and slidably connected, forming a closed space between the inner tube 5 and the outer tube 6. The two first air cylinders 7 are respectively fixedly connected to the opposite ends of the two protrusions 3. The first piston plate 8 is sealed and slidably connected to the inner side wall of the first air cylinder 7. The first push rod 9 is fixedly connected to the side wall of the first piston plate 8. The first push rod 9 is slidably connected to one side wall of the first air cylinder 7. The first push rod 9 and the first air cylinder 7 are not sealed.

[0023] The protrusion 3 is also provided with a buffer mechanism, which includes an airbag 10 and a buffer spring 11. The two airbags 10 are respectively fixedly connected to the two ends of the inner sidewall of the fixed plate 1. The airbags 10 are fixedly connected to the protrusion 3. The two buffer springs 11 are respectively fixedly connected between the protrusion 3 and the fixed plate 1. The buffer mechanism also includes a second air cylinder 12, a second piston plate 13, a second push rod 14, and a push plate 15. The two second air cylinders 12 are respectively fixedly connected to the opposite ends of the two protrusions 3. The second piston plate 13 is sealed and slidably connected to the inner sidewall of the second air cylinder 12. The second push rod 14 is fixedly connected to the sidewall of the second piston plate 13. The second push rod 14 is slidably connected to one sidewall of the second air cylinder 12. The second push rod 14 and the second air cylinder 12 are not sealed. The push plate 15 is fixedly connected to the end of the second push rod 14 away from the second piston plate 13.

[0024] A fixing ring 37 is fixedly connected to the inner wall of the ventilation duct body 4. A worm gear 16 is rotatably connected inside the fixing ring 37. A fan blade 17 is fixedly connected to one end of the worm gear 16. A rotating shaft 18 is rotatably connected to the inner wall of the ventilation duct body 4. A worm wheel 19 is fixedly connected to the outer surface of the rotating shaft 18. The worm wheel 19 meshes with the worm gear 16. The fan blade 17 is significantly different in size from the first air cylinder 7 and the second air cylinder 12, thus it is sufficient to drive the first air cylinder 7 and the second air cylinder 12. The first air cylinder 7 evacuates the sealed space between the inner pipe 5 and the outer pipe 6 to near vacuum and then stops working until gas re-enters the sealed space. Similarly, the second air cylinder 12 only needs to keep the air bag 10 in a gas-filled state. Therefore, neither of them requires a large power drive. Thus, the airflow inside the duct is sufficient to drive the fan blade 17 drive device.

[0025] A limiting rod 20 is fixedly connected to the upper end face of the ventilation duct body 4. A limiting block 21 is fixedly connected to the upper end face of the limiting rod 20. A reciprocating screw 22 is rotatably connected to the lower end face of the limiting block 21. A connecting plate 23 is threadedly connected to the reciprocating screw 22. The connecting plate 23 is slidably connected to the limiting rod 20. The limiting rod 20 limits the connecting plate 23 to prevent it from rotating and shifting due to movement on the reciprocating screw 22. Two adjusting rods 24 are fixedly connected to the end of the protrusion 3 near the second air cylinder 12. Adjusting rods 24 are slidably connected to the two adjusting rods 24. A compression spring 36 is fixedly connected between the adjusting plate 25, the push plate 15, and the second air cylinder 12. An adjusting spring 35 is fixedly connected between the adjusting plate 25 and the push plate 15. The adjusting spring 35 has a small elastic force. When there is less gas in the airbag 10, the pressure in the second air cylinder 12 is small, and the adjusting spring 35 is sufficient to push the second piston plate 13 to move. When there is more gas in the airbag 10, the pressure in the second air cylinder 12 is large, and the adjusting spring 35 is insufficient to push the second piston plate 13 to move, so that there is no excessive gas in the airbag 10, which may cause the airbag 10 to rupture.

[0026] The end of the adjusting plate 25 away from the second air cylinder 12 and the end of the first push rod 9 away from the first piston plate 8 are both fixedly connected to wedge blocks 26. A return spring 34 is fixedly connected between the first air cylinder 7 and one of the wedge blocks 26 near the first push rod 9. Wedge seats 27 are fixedly connected to both ends of the connecting plate 23 near the wedge blocks 26. The wedge blocks 26 and the wedge seats 27 are slidably connected. Both the wedge blocks 26 and the wedge seats 27 are triangular.

[0027] The lower end of the reciprocating lead screw 22 and the upper end of the rotating shaft 18 are both fixedly connected to magnetic couplers 29. The magnetic couplers 29 eliminate the need to drill holes in the ventilation pipe body 4 when transmitting power, thus ensuring the airtightness of the ventilation pipe body 4.

[0028] An air inlet pipe 30 is fixedly connected between the first air cylinder 7 and the outer pipe 6. An air outlet pipe 31 is fixedly connected to the side wall of the first air cylinder 7. An air inlet pipe 32 is fixedly connected between the second air cylinder 12 and the air bag 10. An exhaust pipe 33 is fixedly connected to the side wall of the second air cylinder 12. One-way valves are installed in the air inlet pipe 30, the air outlet pipe 31, the air inlet pipe 32, and the exhaust pipe 33. The flow direction of the one-way valve in the air inlet pipe 30 is from the outer pipe 6 to the first air cylinder 7. The flow direction of the one-way valve in the air outlet pipe 31 is from the first air cylinder 7 to the outside. The flow direction of the one-way valve in the air inlet pipe 32 is from the outside to the second air cylinder 12. The flow direction of the one-way valve in the exhaust pipe 33 is from the second air cylinder 12 to the air bag 10.

[0029] In this invention, when blasting occurs in a coal mine, the two protrusions 3 will cause the two ventilation pipe bodies 4 to slide on the slide bar 2. The airbag 10 and the buffer spring 11 will absorb the shock wave. The two ventilation pipe bodies 4 are connected by an elastic tube 28. The elastic tube 28 is made of flexible composite materials such as canvas and rubber, and has properties such as extensibility, corrosion resistance and explosion resistance. When the two ventilation pipe bodies 4 are vibrated and move away from or close to each other, they will not come into contact with each other and be damaged because of the soft connection of the elastic tube 28 in the middle. Moreover, the elastic tube 28 has extensibility and will not be torn.

[0030] Under the action of an external fan, the ventilation duct body 4 ventilates normally. The high-speed airflow drives the fan blades 17 to rotate. The fan blades 17 drive the worm wheel 19 to rotate via the worm gear 16. The worm wheel 19 drives the magnetic coupler 29 to rotate via the rotating shaft 18. The magnetic coupler 29 connected to the rotating shaft 18 drives the magnetic coupler 22 connected to the reciprocating screw 22 to rotate, thereby causing the reciprocating screw 22 to rotate. The magnetic coupler 29 eliminates the need to drill holes in the ventilation duct body 4 when transmitting power, ensuring the airtightness of the ventilation duct body 4. The rotation of the reciprocating screw 22 causes the connecting plate 23 to move vertically on the reciprocating screw 22. During the reciprocating motion, under the action of the limiting rod 20, the connecting plate 23 will not rotate and cause offset. The connecting plate 23 drives the two wedge seats 27 to move up and down reciprocally. Both the wedge seats 27 and the wedge blocks 26 are triangular, and the inclined surfaces of the wedge seats 27 and the wedge blocks 26 are in contact with each other. When the wedge seats 27 approach the wedge blocks 26, they will squeeze the wedge blocks 26. Under the squeezing force, the wedge blocks 26 move towards the first protrusion 3. The wedge blocks 26 connected to the first push rod 9 drive the first piston plate 8 towards the first air cylinder 7 through the first push rod 9, and compress the return spring 34. The first piston plate 8 and the first... The space between the air cylinders 7 decreases, creating a positive pressure. Under this pressure, the one-way valve in the outlet pipe 31 opens, and the one-way valve in the inlet pipe 30 closes. Gas in the first air cylinder 7 enters the outside through the outlet pipe 31. When the wedge seat 27 disengages from the wedge block 26, the pressure on the wedge block 26 disappears. Under the elastic force of the return spring 34, the first piston plate 8 returns to its original position. The space between the first piston plate 8 and the first air cylinder 7 increases, creating a negative pressure. Under this pressure, the one-way valve in the outlet pipe 31 closes, and the one-way valve in the inlet pipe 30 opens. Gas between the inner pipe 5 and the outer pipe 6 enters the first air cylinder 7 through the inlet pipe 30. As the device operates, the gas between the inner tube 5 and the outer tube 6 is continuously drawn to the outside. The connection between the two ventilation pipe bodies 4 and the elastic tube 28 is close to a vacuum, so the outside gas cannot corrode the connection, and harmful gases will not enter the pipe from the connection, posing a threat to the health of the staff. When the inner tube 5 and the outer tube 6 are close to a vacuum, the first piston plate 8 and the first air cylinder 7 are also close to a vacuum. The return spring 34 cannot be reset, and the wedge block 26 no longer contacts the wedge seat 27 until the outside air slowly seeps in, and the space between the inner tube 5 and the outer tube 6 contains a certain amount of gas again.

[0031] When the wedge seat 27 approaches the wedge block 26, the wedge block 26 connected to the adjusting plate 25 drives the push plate 15 to move through the compression adjusting spring 35. The push plate 15 drives the second piston plate 13 to move towards the second air cylinder 12 through the second push rod 14, and compresses the squeeze spring 36. The space between the second piston plate 13 and the second air cylinder 12 decreases and becomes positive pressure. Under the action of pressure, the one-way valve in the exhaust pipe 33 opens, and the one-way valve in the air inlet pipe 32 opens. The gas in the second air cylinder 12 enters the air bag 10 along the exhaust pipe 33, keeping the air bag 10 in a relatively full state, which can provide a better cushioning effect and avoid damage to the ventilation pipe body 4. When the wedge seat 27 disengages from the wedge block 26, under the elastic force of the adjusting spring 35 and the squeeze spring 36, the second piston plate 13 returns to its original position, and the space between the second piston plate 13 and the second air cylinder 12 decreases and becomes positive pressure. The space between 2 increases to create negative pressure. Under the pressure, the one-way valve in the exhaust pipe 33 closes, and the one-way valve in the inlet pipe 32 opens. External gas enters the second air cylinder 12 through the inlet pipe 32. The elastic force of the adjusting spring 35 is small. When the gas in the airbag 10 is relatively full, the air pressure is high. The air pressure in the second air cylinder 12 is also high. When the wedge block 26 drives the adjusting spring 35 to move towards the second air cylinder 12, only the adjusting spring 35 deforms, while the second piston plate 13 does not move. The gas in the second air cylinder 12 no longer enters the airbag 10, thus avoiding excessive gas in the airbag 10 and damage to the airbag 10. This continues until the device runs continuously and the gas in the airbag 10 leaks. Only then will the gas in the second air cylinder 12 re-enter the airbag 10, keeping the airbag 10 full and ensuring the shock absorption and buffering effect, thus preventing damage to the ventilation pipe body 4.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A ventilation duct support device, comprising a fixing plate (1) and a sliding rod (2) fixed to a wall, characterized in that, The side wall of the fixed plate (1) is provided with a sliding groove, and the two sliding rods (2) are respectively fixedly connected to the two ends of the inner side wall of the sliding groove. The two ends of the two sliding rods (2) are respectively slidably connected to the protrusions (3), and the ventilation pipe body (4) is respectively fixedly connected inside the two protrusions (3). The protrusion (3) is provided with a protective mechanism, which includes an inner tube (5), an outer tube (6), a first air cylinder (7), a first piston plate (8), and a first push rod (9). The inner tube (5) and the outer tube (6) are respectively fixedly connected to the side walls of the two protrusions (3) that are close to each other. The inner tube (5) and the outer tube (6) are slidably connected. The two first air cylinders (7) are respectively fixedly connected to the two protrusions (3) that are opposite to each other. The first piston plate (8) is slidably connected to the inner side wall of the first air cylinder (7). The first push rod (9) is fixedly connected to the side wall of the first piston plate (8). The first push rod (9) is slidably connected to one side wall of the first air cylinder (7). The protrusion (3) is also provided with a buffer mechanism, which includes an airbag (10) and a buffer spring (11). The two airbags (10) are respectively fixedly connected to the two ends of the inner sidewall of the fixed plate (1). The airbags (10) are fixedly connected to the protrusion (3), and the two buffer springs (11) are respectively fixedly connected between the protrusion (3) and the fixed plate (1).

2. The ventilation duct support device according to claim 1, characterized in that, The buffer mechanism further includes a second air cylinder (12), a second piston plate (13), a second push rod (14), and a push plate (15). The two second air cylinders (12) are respectively fixedly connected to the opposite ends of the two protrusions (3). The second piston plate (13) is slidably connected to the inner side wall of the second air cylinder (12). The second push rod (14) is fixedly connected to the side wall of the second piston plate (13). The second push rod (14) is slidably connected to one side wall of the second air cylinder (12). The push plate (15) is fixedly connected to the end of the second push rod (14) away from the second piston plate (13).

3. A ventilation duct support device according to claim 2, characterized in that, A fixing ring (37) is fixedly connected to the inner wall of the ventilation pipe body (4). A worm (16) is rotatably connected inside the fixing ring (37). A fan blade (17) is fixedly connected to one end of the worm (16). A rotating shaft (18) is rotatably connected to the inner wall of the ventilation pipe body (4). A worm wheel (19) is fixedly connected to the outer surface of the rotating shaft (18). The worm wheel (19) meshes with the worm (16).

4. A ventilation duct support device according to claim 3, characterized in that, A limiting rod (20) is fixedly connected to the upper end face of the ventilation pipe body (4), a limiting block (21) is fixedly connected to the upper end face of the limiting rod (20), a reciprocating screw (22) is rotatably connected to the lower end face of the limiting block (21), a connecting plate (23) is threadedly connected to the reciprocating screw (22), and the connecting plate (23) is slidably connected to the limiting rod (20).

5. A ventilation duct support device according to claim 4, characterized in that, Two adjusting rods (24) are fixedly connected to one end of the protrusion (3) near the second air cylinder (12), and adjusting plates (25) are slidably connected to the two adjusting rods (24).

6. A ventilation duct support device according to claim 5, characterized in that, The end of the adjusting plate (25) away from the second air cylinder (12) and the end of the first push rod (9) away from the first piston plate (8) are both fixedly connected to wedge blocks (26). The two ends of the connecting plate (23) near the wedge blocks (26) are respectively fixedly connected to wedge seats (27). The wedge blocks (26) and the wedge seats (27) are slidably connected.

7. A ventilation duct support device according to claim 4, characterized in that, The two ventilation pipe bodies (4) are fixedly connected to an elastic tube (28), and the lower end of the reciprocating screw (22) and the upper end of the rotating shaft (18) are both fixedly connected to a magnetic coupler (29).

8. A ventilation duct support device according to claim 1, characterized in that, An air inlet pipe (30) is fixedly connected between the first air cylinder (7) and the outer tube (6). An air outlet pipe (31) is fixedly connected to the side wall of the first air cylinder (7). An air inlet pipe (32) is fixedly connected between the second air cylinder (12) and the air bag (10). An exhaust pipe (33) is fixedly connected to the side wall of the second air cylinder (12). A one-way valve is provided in the air inlet pipe (30), the air outlet pipe (31), the air inlet pipe (32), and the exhaust pipe (33).

9. A ventilation duct support device according to claim 6, characterized in that, A return spring (34) is fixedly connected between the first air cylinder (7) and one of the wedge blocks (26) near the first push rod (9), an adjustment spring (35) is fixedly connected between the adjustment plate (25) and the push plate (15), and a compression spring (36) is fixedly connected between the push plate (15) and the second air cylinder (12).

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