Rotatable air door with adjustable ventilation area

Abstract

The invention relates to the technical field of mine ventilation, in particular to a rotatable air door capable of adjusting the ventilation area. According to the rotatable air door with the adjustable ventilation area, the adjustment range of the ventilation quantity of the air door can be widened, so that different ventilation requirements in a mine are met. A rotatable air door capable of adjusting the ventilation area comprises a door frame and an adjusting mechanism, and the adjusting mechanism capable of adjusting the ventilation quantity is arranged on the door frame. The air cylinder is started to drive the retractable door to move, so that the retractable door is retracted into the revolving door, the area between the retractable door and the revolving door is adjusted, then the first servo motor is started to drive the first connecting piece to rotate, so that the revolving door rotates, the angle of the revolving door is adjusted, and the adjustment range of the ventilation quantity of the air door can be widened; therefore, different ventilation requirements in the mine can be met.

Description

Technical Field

[0001] The invention relates to the technical field of mine ventilation, and in particular to a rotatable damper capable of adjusting the ventilation area. Background Art

[0002] Mine dampers are an important facility used to control ventilation systems in coal mines and other underground mines. They play a vital role in ensuring the air quality inside the mine and preventing the accumulation of harmful gases. In the mine ventilation system, the ventilation area of ​​the damper directly affects the ventilation effect and safety.

[0003] Existing mine dampers usually adjust the ventilation area of ​​the damper by rotating the door panel angle. However, since the area of ​​the door panel is fixed and the angle at which the door panel can rotate is limited, the adjustment range of the ventilation area of ​​the damper is limited, and it is difficult to adjust according to actual needs, resulting in poor ventilation effect or energy waste.

[0004] Therefore, a rotatable damper with an adjustable ventilation area that can increase the adjustment range of the damper ventilation volume has been developed to meet different ventilation needs in the mine. Summary of the invention

[0005] In order to overcome the shortcomings of existing mine dampers, in which the area of ​​the door panel is fixed and the angle through which the door panel can rotate is limited, resulting in a limited adjustment range for the ventilation area of ​​the damper, making it difficult to adjust according to actual needs, resulting in poor ventilation effect or energy waste, the present invention provides a rotatable damper with an adjustable ventilation area that can increase the adjustment range of the damper ventilation volume, so as to meet different ventilation needs in the mine.

[0006] The technical implementation scheme of the present invention is: a rotatable damper with adjustable ventilation area, comprising a door frame and an adjustment mechanism, wherein the door frame is provided with an adjustment mechanism capable of adjusting the ventilation volume.

[0007] More preferably, the adjusting mechanism includes a first servo motor, a first connecting piece, a revolving door, a telescopic door, a cylinder and a fixing piece, the first servo motor is connected to the upper sides of the left and right parts of the door frame, the upper and lower parts of the door frame are rotatably connected to the left and right first connecting pieces, the output shafts of the first servo motor are connected to adjacent first connecting pieces, the revolving door is connected between two vertically adjacent first connecting pieces, the telescopic door is slidably connected to the revolving door, the upper and lower front sides of the revolving door are connected to the cylinder, the upper and lower front sides of the telescopic door are connected to the fixing pieces, the telescopic ends of the cylinder are connected to the adjacent fixing pieces, the cylinder is started to drive the telescopic door to move, so that the telescopic door is retracted into the revolving door, the area between the telescopic door and the revolving door is adjusted, and the first servo motor is started again to drive the first connecting piece to rotate, so that the revolving door rotates and the angle of the revolving door is adjusted.

[0008] More preferably, ventilation slots are provided on the revolving doors.

[0009] More preferably, the auxiliary mechanism includes a first fixed seat, a pull plate, a second connecting member, a winding rack, a pull rope, a second servo motor, a rotating shaft and a first gear, the first fixed seat is connected to the front and rear sides of the lower part of the door frame, the first fixed seat is rotatably connected to the pull plate, the left and right sides of the pull plate are connected to the second connecting member, the front and rear sides of the upper part of the door frame are connected to the left and right winding racks, the winding racks are rotatably connected to the rotating shafts, the pull ropes are wound around the rotating shafts, the lower parts of the pull ropes are connected to the adjacent second connecting members, the left and right sides of the upper part of the door frame are connected to the second servo motor, and the output shafts of the second servo motor are connected to the A first gear is connected, and the outer side of the rear rotating shaft is also connected to the first gear. The two adjacent first gears are meshed with each other. The front rotating shaft is connected to the adjacent second servo motor output shaft with a belt through a transmission wheel. After the door frame is installed in the mine, the pull plate on the first fixed seat is in contact with the ground. When the equipment needs to pass through the door frame, the equipment is moved onto the pull plate to pass through the door frame. When it is necessary to block the equipment or personnel from passing through, the second servo motor is started to drive the first gear to rotate, so that the first gear meshes and moves. The belt rotates, driving the rotating shaft to rotate, so that the pull rope pulls up the pull plate to cover both sides of the door frame.

[0010] More preferably, a rotating plate mechanism is also included, which includes a sliding rack, a fixed shaft, a second gear, a rotating plate and a limit plate. The telescopic end of the cylinder is slidably connected to a sliding rack, the upper and lower parts of the revolving door are rotatably connected to the fixed shaft, the front and rear sides of the fixed shaft are connected to the second gear, the second gear is meshed with adjacent sliding racks, the front and rear parts of the fixed shaft are connected to rotating plates, the rotating plates are in contact with adjacent revolving doors, and the front and rear sides of the revolving door are connected to limit plates. When the telescopic end of the cylinder is extended, it drives the sliding rack to move, so that the sliding rack triggers the second gear to rotate, and drives the fixed shaft to rotate, so that the rotating plate rotates and tilts and no longer blocks the ventilation slot on the revolving door.

[0011] More preferably, a guide mechanism is also included, which includes a second fixed seat, a third servo motor, a rotating frame and a guide fan. The second fixed seat is connected to both the front and rear sides of the middle of the door frame, and the third servo motor is connected to both the front and rear sides of the middle of the door frame. The third servo motor is located on the right side of the second fixed seat. The second fixed seat is rotatably connected to the rotating frame, and the output shaft of the third servo motor is connected to the adjacent rotating frame. Multiple guide fans are connected to the rotating frame. When the concentration of harmful gases in the mine is high, the third servo motor is started to drive the rotating frame to rotate, so that the guide fan rotates to a vertical state, and then the guide fan is started so that the guide fan can guide the harmful gases out through the ventilation slots on the revolving door.

[0012] More preferably, it further includes a protection rod, and a plurality of protection rods are connected to the outside of the guide fan, and the protection rods protect the guide fan.

[0013] More preferably, a stabilizing mechanism is also included, which includes a third fixed seat, a connecting plate, an insertion rod and a torsion spring. A plurality of third fixed seats are connected to the front and rear sides of the left part and the front and rear sides of the right part of the door frame. The third fixed seats are rotatably connected to connecting plates. Two upper and lower torsion springs are connected between the connecting plates and the connected third fixed seats. Insertion rods are connected to the connecting plates. When the door frame is installed in a mine, the connecting plates are rotated outward and the torsion springs are deformed. After the door frame is installed in the mine, the connecting plates are loosened and the torsion springs are restored, so that the connecting plates move inward and then the insertion rods are inserted into the mine.

[0014] More preferably, a supporting mechanism is also included, the supporting mechanism includes a fixing plate and a nail, a plurality of fixing plates are connected to the lower part of the door frame, the left and right parts of the fixing plates are clamped with nails, when the door frame is placed in the mine, the fixing plates are in contact with the ground, and then the fixing plates are fixed to the ground by the nails, and the reinforcing plates are used to strengthen the structural strength of the fixing plates.

[0015] More preferably, a reinforcing plate is further included, and a plurality of reinforcing plates are connected to the upper side of the fixing plate, and the reinforcing plates are used to strengthen the structural strength of the fixing plate.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The present invention starts the cylinder to drive the telescopic door to move, so that the telescopic door shrinks into the revolving door, adjusts the area between the telescopic door and the revolving door, and then starts the first servo motor to drive the first connecting part to rotate, so that the revolving door rotates and adjusts the angle of the revolving door, thereby achieving the effect of increasing the adjustment range of the air door ventilation volume to meet different ventilation needs in the mine.

[0017] 2. After the present invention is installed in the mine through the door frame, the pull plate on the first fixed seat contacts the ground. When the equipment needs to pass through the door frame, the equipment is moved onto the pull plate to pass through the door frame. When it is necessary to block the equipment or personnel from passing through, the second servo motor is started to drive the first gear to rotate, so that the first gear meshes and moves, driving the rotating shaft to rotate, so that the pull rope pulls up the pull plate to block both sides of the door frame, thereby achieving the effect of facilitating the transportation of mine equipment and isolating the mine at the same time.

[0018] 3. When the telescopic end of the cylinder of the present invention is extended, the sliding rack is driven to move, so that the sliding rack triggers the second gear to rotate, and drives the fixed shaft to rotate, so that the rotating plate rotates and tilts and no longer blocks the ventilation slots on the rotating door, thereby achieving the effect of maintaining ventilation in the mine and avoiding the accumulation of harmful gases in the mine.

[0019] 4. When the concentration of harmful gases in the mine is high, the present invention starts the third servo motor to drive the rotating frame to rotate, so that the guide fan rotates to a vertical state, and then starts the guide fan to guide the harmful gases out through the ventilation slots on the revolving door, thereby achieving the effect of accelerating the air circulation in the mine and reducing the concentration of harmful gases.

[0020] 5. The present invention achieves the effect of enhancing the stability of the door frame and preventing the door frame from loosening by rotating the connecting plate outwards when the door frame is installed in the mine and deforming the torsion spring. After the door frame is installed in the mine, the connecting plate is loosened and the torsion spring is restored, so that the connecting plate moves inwards and the insertion rod is inserted into the mine.

[0021] 6. When the door frame of the present invention is placed in a mine, the fixing plate contacts the ground, and then the fixing plate is fixed to the ground by inserting nails, thereby achieving the effect of supporting the door frame and improving the stability of the door frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0023] Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention.

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the adjustment mechanism of the present invention.

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the auxiliary mechanism of the present invention.

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the rotating plate mechanism of the present invention.

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the flow guiding mechanism of the present invention.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the stabilizing mechanism of the present invention.

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of the support mechanism of the present invention.

[0030] The markings of the components in the accompanying drawings are as follows: 1: door frame, 2: adjustment mechanism, 21: first servo motor, 22: first connecting piece, 23: revolving door, 24: telescopic door, 25: cylinder, 26: fixing piece, 3: auxiliary mechanism, 31: first fixing seat, 32: pull plate, 33: second connecting piece, 34: winding rack, 35: pull rope, 36: second servo motor, 37: rotating shaft, 38: first gear, 4: rotating plate mechanism, 41: sliding rack, 42: fixed shaft, 43: second gear, 44: rotating plate, 45: limiting plate, 5: guide mechanism, 51: second fixing seat, 52: third servo motor, 53: rotating frame, 54: guide fan, 55: protective rod, 6: stabilizing mechanism, 61: third fixing seat, 62: connecting plate, 63: plug rod, 64: torsion spring, 7: supporting mechanism, 71: fixing plate, 72: plug nail, 73: reinforcing plate. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] A rotatable damper capable of adjusting the ventilation area, such as Figure 1 and Figure 2 As shown, it includes a door frame 1 and an adjusting mechanism 2, and the door frame 1 is provided with the adjusting mechanism 2.

[0033] like Figure 1 and Figure 3 As shown, the adjustment mechanism 2 includes a first servo motor 21, a first connecting member 22, a revolving door 23, a telescopic door 24, a cylinder 25 and a fixing member 26. The upper sides of the left and right parts of the door frame 1 are connected to the first servo motors 21, and the upper and lower parts of the door frame 1 are rotatably connected to the left and right first connecting members 22. The output shafts of the first servo motors 21 are connected to adjacent first connecting members 22. The revolving doors 23 are connected between two vertically adjacent first connecting members 22. Ventilation slots are provided on the revolving doors 23 to facilitate ventilation. The telescopic doors 24 are slidably connected to the revolving doors 23. The upper and lower front sides of the revolving door 23 are connected to the cylinders 25. The upper and lower front sides of the telescopic door 24 are connected to the fixing members 26, and the telescopic ends of the cylinders 25 are connected to the adjacent fixing members 26.

[0034] When using the present invention, the door frame 1 is first installed in the mine. When the ventilation volume in the mine needs to be adjusted, the cylinder 25 is started to drive the telescopic door 24 to move, so that the telescopic door 24 is retracted into the revolving door 23, and the area between the telescopic door 24 and the revolving door 23 is adjusted. Then, the first servo motor 21 is started to drive the first connecting member 22 to rotate, so that the revolving door 23 rotates, and the angle of the revolving door 23 is adjusted, thereby increasing the adjustment range of the air door ventilation volume to meet different ventilation needs in the mine.

[0035] like Figure 1 and Figure 4 As shown, the auxiliary mechanism 3 includes a first fixed seat 31, a pull plate 32, a second connecting member 33, a winding frame 34, a pull rope 35, a second servo motor 36, a rotating shaft 37 and a first gear 38. The front and rear sides of the lower part of the door frame 1 are connected to the first fixed seat 31, the pull plate 32 is rotatably connected to the first fixed seat 31, the left and right sides of the pull plate 32 are connected to the second connecting member 33, the front and rear sides of the upper part of the door frame 1 are connected to the left and right winding frames 34, and the winding frames 34 are rotatably connected to the first fixed seat 31. A rotating shaft 37 is connected, and a pull rope 35 is wound around the rotating shaft 37. The lower part of the pull rope 35 is connected to the adjacent second connecting member 33. The second servo motor 36 is connected to the left and right sides of the upper part of the door frame 1. The first gear 38 is connected to the output shaft of the second servo motor 36. The outer side of the rotating shaft 37 on the rear side is also connected to the first gear 38. The two adjacent first gears 38 are meshed with each other. The rotating shaft 37 on the front side is connected to the adjacent second servo motor 36 output shaft through a transmission wheel with a belt.

[0036] The auxiliary mechanism 3 of the device can be used to facilitate the transportation of mine equipment. After the door frame 1 is installed in the mine, the pull plate 32 on the first fixed seat 31 is in contact with the ground. When the equipment needs to pass through the door frame 1, the equipment is moved to the pull plate 32 to pass through the door frame 1. When it is necessary to block the equipment or personnel from passing through, the second servo motor 36 is started to drive the first gear 38 to rotate, so that the first gear 38 engages and moves, the belt rotates, and drives the rotating shaft 37 to rotate, so that the pull rope 35 pulls up the pull plate 32 to cover both sides of the door frame 1, thereby facilitating the transportation of mine equipment and isolating the mine.

[0037] like Figure 1 and Figure 5 As shown, a rotating plate mechanism 4 is also included, and the rotating plate mechanism 4 includes a sliding rack 41, a fixed shaft 42, a second gear 43, a rotating plate 44 and a limit plate 45. The sliding rack 41 is slidably connected to the telescopic end of the cylinder 25, and the upper and lower parts of the revolving door 23 are rotatably connected to the fixed shaft 42. The front and rear sides of the fixed shaft 42 are connected to the second gear 43, and the second gear 43 is meshed with the adjacent sliding rack 41. The front and rear parts of the fixed shaft 42 are connected to the rotating plates 44, and the rotating plates 44 are in contact with the adjacent revolving doors 23. The front and rear sides of the revolving door 23 are connected to the limit plates 45.

[0038] The rotating plate mechanism 4 of the present device can maintain ventilation in the mine. When the telescopic end of the cylinder 25 is extended, the sliding rack 41 is driven to move, so that the sliding rack 41 triggers the second gear 43 to rotate, and drives the fixed shaft 42 to rotate, so that the rotating plate 44 rotates and tilts and no longer blocks the ventilation slots on the rotating door 23, thereby maintaining ventilation in the mine and avoiding the accumulation of harmful gases in the mine. When the telescopic end of the cylinder 25 is retracted, the sliding rack 41 triggers the second gear 43 to rotate and reset, so that the rotating plate 44 rotates and contacts with the limit plate 45 to block the ventilation slots on the rotating door 23.

[0039] like Figure 1 and Figure 6 As shown, the door frame 1 further includes a guide mechanism 5, which includes a second fixed seat 51, a third servo motor 52, a rotating frame 53, a guide fan 54 and a protective rod 55. The second fixed seat 51 is connected to both the front and rear sides of the middle part of the door frame 1, and the third servo motor 52 is connected to both the front and rear sides of the middle part of the door frame 1. The third servo motor 52 is located on the right side of the second fixed seat 51. The second fixed seat 51 is rotatably connected to the rotating frame 53. The output shaft of the third servo motor 52 is connected to the adjacent rotating frame 53. Four guide fans 54 are connected to the rotating frame 53, and eleven protective rods 55 are connected to the outer side of the guide fan 54.

[0040] The use of the guide mechanism 5 of the present device can speed up the air circulation in the mine. When the concentration of harmful gases in the mine is high, the third servo motor 52 is started to drive the rotating frame 53 to rotate, so that the guide fan 54 rotates to a vertical state, and then the guide fan 54 is started to guide the harmful gases out through the ventilation slots on the revolving door 23. The protective rod 55 protects the guide fan 54, thereby speeding up the air circulation in the mine and reducing the concentration of harmful gases.

[0041] like Figure 1 and Figure 7 As shown, a stabilizing mechanism 6 is also included, and the stabilizing mechanism 6 includes a third fixed seat 61, a connecting plate 62, an insertion rod 63 and a torsion spring 64. Three third fixed seats 61 are connected to the front and rear sides of the left part and the front and rear sides of the right part of the door frame 1. The third fixed seats 61 are rotatably connected to the connecting plates 62. The connecting plates 62 are connected to the third fixed seats 61 with two upper and lower torsion springs 64, and the connecting plates 62 are connected to the third fixed seats 61.

[0042] By using the stabilizing mechanism 6 of the device, the stability of the door frame 1 can be enhanced. When the door frame 1 is installed in a mine, the connecting plate 62 is rotated outward, and the torsion spring 64 is deformed. After the door frame 1 is installed in the mine, the connecting plate 62 is loosened, and the torsion spring 64 is restored, so that the connecting plate 62 moves inward, and then the insertion rod 63 is inserted into the mine, thereby enhancing the stability of the door frame 1 and preventing the door frame 1 from loosening.

[0043] like Figure 1 and Figure 8 As shown, it also includes a support mechanism 7, which includes a fixing plate 71, a pin 72 and a reinforcing plate 73. Four fixing plates 71 are connected to the lower part of the door frame 1. The left and right parts of the fixing plates 71 are both clamped with the pins 72, and the upper side of the fixing plates 71 is connected to three reinforcing plates 73.

[0044] The support mechanism 7 of the device can be used to support the door frame 1. When the door frame 1 is placed in the mine, the fixing plate 71 is in contact with the ground, and then the fixing plate 71 is fixed to the ground by the nails 72. The reinforcing plate 73 is used to strengthen the structural strength of the fixing plate 71, thereby supporting the door frame 1 and improving the stability of the door frame 1.

[0045] It should be understood that the above description is only for exemplary purposes and is not meant to limit the present invention. Those skilled in the art will appreciate that variations of the present invention will be included within the scope of the claims herein.

Claims

1. A rotatable damper capable of adjusting the ventilation area, characterized in that: The invention comprises a door frame (1) and an adjusting mechanism (2), wherein the door frame (1) is provided with the adjusting mechanism (2) capable of adjusting the ventilation volume.

2. The rotatable damper with adjustable ventilation area according to claim 1, characterized in that: The adjusting mechanism (2) comprises a first servo motor (21), a first connecting member (22), a revolving door (23), a telescopic door (24), a cylinder (25) and a fixing member (26); the upper sides of the left and right parts of the door frame (1) are both connected to the first servo motor (21); the upper and lower parts of the door frame (1) are both rotatably connected to the left and right first connecting members (22); the output shaft of the first servo motor (21) is connected to the adjacent first connecting members (22); the revolving door (23) is connected between the two vertically adjacent first connecting members (22); the revolving door (23) is slidably connected to the telescopic door (24); The upper and lower front sides of the revolving door (23) are both connected to a cylinder (25), the upper and lower front sides of the telescopic door (24) are both connected to a fixing piece (26), the telescopic ends of the cylinder (25) are both connected to the adjacent fixing piece (26), the cylinder (25) is started to drive the telescopic door (24) to move, so that the telescopic door (24) is retracted into the revolving door (23), and the area between the telescopic door (24) and the revolving door (23) is adjusted, and then the first servo motor (21) is started to drive the first connecting piece (22) to rotate, so that the revolving door (23) rotates, and the angle of the revolving door (23) is adjusted.

3. The rotatable damper with adjustable ventilation area according to claim 2 is characterized in that: The revolving door (23) is provided with ventilation slots.

4. The rotatable damper with adjustable ventilation area according to claim 2 is characterized in that: The auxiliary mechanism (3) comprises a first fixed seat (31), a pull plate (32), a second connecting member (33), a winding frame (34), a pull rope (35), a second servo motor (36), a rotating shaft (37) and a first gear (38). The first fixed seat (31) is connected to both the front and rear sides of the lower part of the door frame (1). The first fixed seat (31) is rotatably connected to the pull plate (32). The left and right sides of the pull plate (32) are connected to the second connecting member (33). The left and right sides of the upper part of the door frame (1) are connected to both the left and right winding frames (34). The winding frames (34) are rotatably connected to the rotating shaft (37). The pull rope (35) is wound around the rotating shaft (37). The lower part of the pull rope (35) is connected to the adjacent second connecting member (33). The left and right sides of the upper part of the door frame (1) are connected to the second servo motor (36). The output shaft of the machine (36) is connected with a first gear (38), and the outer side of the rear rotating shaft (37) is also connected with a first gear (38). Two adjacent first gears (38) are meshed with each other. A belt is wound around the output shaft of the adjacent second servo motor (36) through a transmission wheel between the front rotating shaft (37). After the door frame (1) is installed in the mine, the pull plate (32) on the first fixed seat (31) contacts the ground. When the equipment needs to pass through the door frame (1), the equipment is moved to the pull plate (32) to pass through the door frame (1). When it is necessary to block the equipment or personnel from passing through, the second servo motor (36) is started to drive the first gear (38) to rotate, so that the first gear (38) meshes and moves. The belt rotates, driving the rotating shaft (37) to rotate, so that the pull rope (35) pulls up the pull plate (32) to cover both sides of the door frame (1).

5. The rotatable damper with adjustable ventilation area according to claim 4 is characterized in that: The invention also comprises a rotating plate mechanism (4), which comprises a sliding rack (41), a fixed shaft (42), a second gear (43), a rotating plate (44) and a limiting plate (45). The telescopic end of the cylinder (25) is slidably connected to the sliding rack (41), the upper and lower parts of the rotating door (23) are rotatably connected to the fixed shaft (42), the front and rear sides of the fixed shaft (42) are connected to the second gear (43), and the second gear (43) is connected to the adjacent sliding rack (41). The fixed shaft (42) is meshed, and the front and rear parts are both connected with a rotating plate (44), and the rotating plate (44) is in contact with the adjacent rotating door (23). The front and rear sides of the rotating door (23) are both connected with a limiting plate (45). When the telescopic end of the cylinder (25) is extended, the sliding rack (41) is driven to move, so that the sliding rack (41) triggers the second gear (43) to rotate, and drives the fixed shaft (42) to rotate, so that the rotating plate (44) rotates and tilts and no longer blocks the ventilation slot on the rotating door (23).

6. The rotatable damper with adjustable ventilation area according to claim 5, characterized in that: The invention also comprises a guide mechanism (5), which comprises a second fixed seat (51), a third servo motor (52), a rotating frame (53) and a guide fan (54). The second fixed seat (51) is connected to both the front and rear sides of the middle part of the door frame (1). The third servo motor (52) is connected to both the front and rear sides of the middle part of the door frame (1). The third servo motor (52) is located on the right part of the second fixed seat (51). The rotating frame (53) is rotatably connected to the second fixed seat (51). The output shaft of the third servo motor (52) is connected to the adjacent rotating frame (53). The rotating frame (53) is connected to a plurality of guide fans (54). When the concentration of harmful gas in the mine is high, the third servo motor (52) is started to drive the rotating frame (53) to rotate, so that the guide fan (54) rotates to a vertical state. The guide fan (54) is started again, so that the guide fan (54) guides the harmful gas through the ventilation slot on the rotating door (23).

7. The rotatable damper with adjustable ventilation area according to claim 6, characterized in that: It also includes protection rods (55), and a plurality of protection rods (55) are connected to the outside of the guide fan (54), and the protection rods (55) protect the guide fan (54).

8. The rotatable damper with adjustable ventilation area according to claim 6, characterized in that: The door frame (1) further comprises a stabilizing mechanism (6), which comprises a third fixing seat (61), a connecting plate (62), an insert rod (63) and a torsion spring (64). The front and rear sides of the left part and the front and rear sides of the right part of the door frame (1) are connected to a plurality of third fixing seats (61). The third fixing seats (61) are rotatably connected to connecting plates (62). The connecting plates (62) are connected to the third fixing seats (61) with two upper and lower torsion springs (64). The connecting plates (62) are connected to the connecting plates (61). When the door frame (1) is installed in a mine, the connecting plates (62) are rotated outwards, and the torsion springs (64) are deformed. After the door frame (1) is installed in the mine, the connecting plates (62) are loosened, and the torsion springs (64) are restored, so that the connecting plates (62) move inwards, and then the insert rods (63) are inserted into the mine.

9. The rotatable damper with adjustable ventilation area according to claim 8, characterized in that: The invention also comprises a support mechanism (7), the support mechanism (7) comprising a fixing plate (71) and a nail (72), a plurality of fixing plates (71) are connected to the lower part of the door frame (1), the left and right parts of the fixing plates (71) are both clamped with the nail (72), when the door frame (1) is placed in a mine, the fixing plates (71) are in contact with the ground, and then the fixing plates (71) are fixed to the ground by the nail (72), and the reinforcing plates (73) are used to strengthen the structural strength of the fixing plates (71).

10. The rotatable damper with adjustable ventilation area according to claim 9, characterized in that: It also includes a reinforcing plate (73), and a plurality of reinforcing plates (73) are connected to the upper side of the fixing plate (71), and the reinforcing plates (73) are used to strengthen the structural strength of the fixing plate (71).

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