Airflow circulation control door device and control method

Abstract

The invention discloses an airflow circulation control door device which comprises a center shaft, a hole is formed in a shaft body of the center shaft in the length direction of the center shaft, an air duct door penetrates through the hole and is connected with the center shaft through a bolt pin, a door frame plate is arranged on the edge of the air duct door, and the two ends of the center shaft penetrate through the two opposite sides of the door frame plate correspondingly. One end of the center shaft is connected with a power piece through a transmission unit, and the power piece is connected with one side of the door frame plate. The invention further discloses a control method of the airflow circulation control door device. According to the invention, a central axis symmetric horizontal air duct door is adopted, the design concept that airflow operation is controlled through a horizontal air duct technological process is adopted, the whole door is a left-right rotary switch, the device is arranged at an air inlet and outlet port of a horizontal air duct of each compartment, airflow is in the horizontal direction, and a power cylinder of the air duct door uses energy as an air source; and the air duct door can be always in an open state when the air flow of the induced draft fan runs, so that the smooth passage of the air flow in each sub-chamber is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of auxiliary equipment for soot purification, and specifically relates to an air flow circulation control door device, and also relates to a control method for the air flow circulation control door device. Background Art

[0002] At present, in industrial enterprises, most of the commonly used soot purification equipment is a negative pressure closed filter collector with an induced draft fan. In order to achieve the purpose of continuous operation, multiple compartments and supporting inlet and outlet air duct mechanisms need to be set in the soot collector. All compartments need to be cleaned offline to achieve the purpose of alternating operation, so as to meet the collection of soot generated during the continuous production operation. The cleaning system mainly consists of three parts: a lifting valve device, a pulse air bag distributor device, and a cleaning and blowing mechanism. Through automated program setting, the dust accumulated on the filter material surface is blown back and removed offline in a cycle, and finally continuous and efficient operation is achieved.

[0003] However, the traditional lifting valve device can no longer meet the safe and stable operation of environmental protection equipment. Defects: The lifting valve device is designed vertically, and the valve stem (push-pull rod) is centered on the valve plate and moves up and down to open and close. Therefore, the pressure used by the power component cylinder must be greater than the operating pressure of the air flow of the induced draft fan used in the soot purification equipment to effectively lift or close the lifting valve to meet normal use. At the same time, in order to reduce the lifting resistance (weight), the commonly used valve plate and valve stem connectors are also relatively thin, and only the end point of the valve stem is connected to the center point of the valve plate, and the two are not fully integrated into one body, and are extremely vulnerable to damage during use, causing the two to separate and the valve plate to fall off and cover the channel, resulting in the interruption of the air flow at this point; secondly, when problems such as too low cylinder pressure or sudden interruption of the air source occur, all lifting valves will automatically close, and the air volume of the lifting valve channel will be completely cut off, resulting in the inability of the dust suction hood to capture the soot at the on-site dust generation point, causing a large amount of soot to spread, thus forming an environmental pollution incident, (such as under the action of a safety interlock mechanism, even causing the entire environmental protection equipment system to stop operating), and unable to ensure the requirements of environmental compliance discharge during normal production. Summary of the Invention

[0004] The purpose of the present invention is to provide an air flow circulation control door device, which solves the problem that the lifting valve automatically closes due to too low cylinder pressure in the prior art.

[0005] Another purpose of the present invention is to provide a control method for the air flow circulation control door device.

[0006] The technical solution adopted by the present invention is an air flow control door device, which includes a central shaft. A pore is provided along the length direction of the shaft body of the central shaft, and an air duct door is inserted into the pore. The air duct door is connected to the central shaft through a bolt pin. A door frame plate is provided at the edge of the air duct door. Both ends of the central shaft respectively pass through opposite sides of the door frame plate. One end of the central shaft is connected to a power component through a transmission unit, and the power component is connected to one side of the door frame plate.

[0007] The features of the present invention further lie in: The air duct door includes steel plates arranged oppositely. The edges of the two steel plates are connected through side plates. A valve plate grid is connected between the two steel plates. The two steel plates pass through the pore, and the central shaft is arranged in the middle of the steel plates. Both steel plates are connected to the central shaft through bolt pins, and air holes are provided on the plate surfaces of the steel plates.

[0008] Round holes are provided on opposite sides of the door frame plate. Both ends of the central shaft respectively pass through the two round holes, and bearings are respectively clamped in the two round holes. The end of the central shaft is connected to the bearings.

[0009] Two steps are provided on the shaft body of the central shaft. The two steps are respectively arranged close to both ends of the central shaft. The steps match the bearings, and the side of the bearing away from the door frame plate is connected to the door frame plate through a fixing clip.

[0010] The transmission unit includes a bent arm. The bent arm is connected to one end of the central shaft, and the end of the bent arm away from the central shaft is connected to the power component.

[0011] The power component includes a power cylinder. The output end of the power cylinder is connected to the bent arm through a connecting pin, and the power cylinder is connected to the door frame plate.

[0012] A fixing seat is connected to the bottom of the power cylinder, and the fixing seat is connected to the door frame plate through bolts.

[0013] A baffle is connected to the inner wall of the door frame plate, and a sealing strip is connected to the side of the baffle away from the door frame plate.

[0014] Another technical solution adopted by the present invention is a control method for the air flow control door device, which is specifically implemented according to the following steps: Step 1. Connect the device completely and place it in a state of horizontal air flow operation; Step 2. The power cylinder pushes the bent arm to drive the central shaft to rotate through the bent arm; Step 3. The central shaft drives the air duct door to rotate. When the edge of the air duct door contacts the sealing strip, the power end of the power cylinder stops operating. At this time, the air duct door is closed. When the power end of the power cylinder contracts, the edge of the air duct door moves away from the sealing strip, thereby driving the air duct door to rotate in the opposite direction, so as to realize a cyclic full operation process.

[0015] The beneficial effects of the present invention are: The air flow control door device of the present invention adopts a horizontally-arranged air duct door with central axis symmetry, and designs the air flow operation through the air flow process of the horizontal air duct. The whole door is a left-right rotary switch. The device is placed at the air inlet and outlet of the horizontal air duct of each compartment, and the air flow passes horizontally. The power component of the air duct door, the cylinder, consumes air source as energy. Therefore, even in the case of insufficient air pressure, the air duct door can always be in the open state under the air flow operation of the induced draft fan, ensuring the smooth passage of the air flow in each compartment, and preventing the air duct from being completely closed due to accidents such as air source or air duct door panel, thus avoiding the problem of the shutdown of the environmental protection equipment system. Fundamentally, it solves the problem of pollution treatment caused by the failure of the production line and pollution treatment equipment to operate synchronously due to faults, and meets the problem of inconsistent operation of production and environmental protection treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural view of the air flow control door device of the present invention; Figure 2 is a sectional view taken along the direction A of the air flow control door device of the present invention; Figure 3 is a sectional view taken along the direction B of the air flow control door device of the present invention; Figure 4 is a schematic structural view of the central axis in the air flow control door device of the present invention; Figure 5 is a side view of the central axis in the air flow control door device of the present invention; Figure 6 is a top view of the air flow control door device of the present invention.

[0017] In the figures: 1. air duct door, 2. round hole, 3. central axis, 4. bolt pin, 5. valve plate grid, 6. steel plate, 7. air hole, 8. vertical rib, 9. door frame plate, 10. flange edge, 11. pore, 12. step, 13. baffle, 14. bearing, 15. bent arm, 16. connecting pin, 17. power cylinder, 18. fixed seat. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The air flow control door device of the present invention, as Figure 1As shown in the figure, it includes a central shaft 3. A pore 11 is provided along the length direction of the shaft body of the central shaft 3. A duct door 1 is inserted into the pore 11. The duct door 1 is connected to the central shaft 3 through a bolt pin 4. A door frame plate 9 is provided at the edge of the duct door 1. Both ends of the central shaft 3 pass through opposite sides of the door frame plate 9 respectively. One end of the central shaft 3 is connected to a power component through a transmission unit, and the power component is connected to one side of the door frame plate 9. The central shaft 3 serves as the axis of symmetry of the duct door 1, transforming the traditional vertical lifting duct valve device that operates by opening and closing up and down into a horizontal device with the duct door 1 that opens and closes symmetrically left and right around the central axis. The horizontal device is placed at the air inlet and outlet of the horizontal duct in each compartment, enabling the airflow of the collector to change from the traditional vertical downward flow direction in each compartment to a natural horizontal flow pattern in each compartment. The power component drives the duct door 1 to rotate through the central shaft 3. When the air source pressure of the power component is insufficient, the duct door 1 can always be in an open state under the operation of the induced draft fan airflow, ensuring the smooth flow of the airflow in each compartment.

[0020] Embodiment 1 An air flow circulation control door device includes a central shaft 3. A pore 11 is provided along the length direction of the shaft body of the central shaft 3. A duct door 1 is inserted into the pore 11. The duct door 1 is connected to the central shaft 3 through a bolt pin 4. A door frame plate 9 is provided around the duct door 1. Both ends of the central shaft 3 pass through opposite sides of the door frame plate 9 respectively. One end of the central shaft 3 is connected to a power component through a transmission unit, and the power component is connected to one side outside the door frame plate 9.

[0021] As Figures 2 - 3 As shown in the figure, the duct door 1 includes steel plates 6 arranged oppositely. The edges of the two steel plates 6 are connected and sealed by side plates to form an integrally enclosed steel plate with an inner cavity. A valve plate grid 5 is connected between the two steel plates 6. The two steel plates 6 pass through the pore 11. The central shaft 3 is arranged in the middle of the steel plates 6. Both steel plates 6 are connected to the central shaft 3 through bolt pins 4. Air holes 7 are provided on the plate surfaces of the steel plates 6. The duct door 1 is set as a rectangle or an ellipse. Multiple connection support points are arranged in the double-layer steel plates 6 using round steel. Each point is welded to the inner side of the double-layer steel plates 6, similar to the shape of a grid, forming the valve plate grid 5. The peripheries of the double-layer steel plates 6 are then welded together with side plates (steel plates) to closely combine all components of the double-layer steel plates 6, forming a hollow double-layer plate structure with internal supports. Then, a central axis is established at equal distance positions at the left and right ends of the double-layer plate. A central shaft 3 is installed at the position of the central axis, connecting both ends of the central shaft. The midline of the central shaft 3 is found. Taking the two ends with appropriate reserved positions as the endpoints on the central axis of the central shaft 3, a strip-shaped pore 11 slightly larger than the width of the double-layer plate is chiseled in the middle part, enabling the double-layer plate to pass through the pore 11. Finally, the double-layer plate is tightly fixed to the central shaft 3 with bolt pins 4 to form an axisymmetric duct door.

[0022] Embodiment 2 Airflow circulation control door device, including a central shaft 3. A pore 11 is provided along the length direction of the shaft body of the central shaft 3. A duct door 1 is inserted into the pore 11. The duct door 1 is connected to the central shaft 3 through a bolt pin 4. A door frame plate 9 is provided at the edge of the duct door 1. Both ends of the central shaft 3 respectively pass through opposite sides of the door frame plate 9. One end of the central shaft 3 is connected to a power member through a transmission unit, and the power member is connected to one side of the door frame plate 9.

[0023] The duct door 1 includes steel plates 6 arranged oppositely. The edges of the two steel plates 6 are connected by side plates. A valve plate grid 5 is connected between the two steel plates 6. The two steel plates 6 pass through the pore 11. The central shaft 3 is arranged in the middle of the steel plates 6. Both steel plates 6 are connected to the central shaft 3 through bolt pins 4. Air holes 7 are provided on the plate surfaces of the steel plates 6.

[0024] Both opposite sides of the door frame plate 9 are provided with round holes 2. Both ends of the central shaft 3 respectively pass through the two round holes 2. Bearings 14 are respectively clamped in the two round holes. The end of the central shaft 3 is connected to the bearing 14. The door frame plate 9 is set according to the shape and size of the duct door 1. The door frame plate 9 is assembled by steel plates, with a flange edge 10 and vertical ribs 8 provided on the periphery. The vertical ribs 8 connect the left and right flanges and the door frame plate 9. The door frame plate 9, the flange edge 10, and the vertical ribs 8 are integrally fusion-welded. The door frame plate 9 is oval or rectangular. Taking the equal-distance points at both ends of the length (left and right) of the door frame plate 9 as the center points, a perpendicular line is set with the center points. Both ends of the perpendicular line respectively intersect the two sides of the width (upper and lower) of the door frame plate. These two intersection points are the fixed points at both ends of the door shaft (central shaft). Two round holes 2 are respectively provided at the fixed points of the door frame plate 9. Bearings 14 are installed in the round holes 2. The bearing 14 and the round hole 2 are a tight-fitting device. The central shaft 3 passes through the bearing 14. When the central shaft 3 rotates, the bearing 14 rolls with it.

[0025] Embodiment 3 Airflow circulation control door device, including a central shaft 3. A pore 11 is provided along the length direction of the shaft body of the central shaft 3. A duct door 1 is inserted into the pore 11. The duct door 1 is connected to the central shaft 3 through a bolt pin 4. A door frame plate 9 is provided at the edge of the duct door 1. Both ends of the central shaft 3 respectively pass through opposite sides of the door frame plate 9. One end of the central shaft 3 is connected to a power member through a transmission unit, and the power member is connected to one side of the door frame plate 9.

[0026] The duct door 1 includes steel plates 6 arranged oppositely. The edges of the two steel plates 6 are connected by side plates. A valve plate grid 5 is connected between the two steel plates 6. The two steel plates 6 pass through the pore 11. The central shaft 3 is arranged in the middle of the steel plates 6. Both steel plates 6 are connected to the central shaft 3 through bolt pins 4. Air holes 7 are provided on the plate surfaces of the steel plates 6.

[0027] Circular holes 2 are provided on opposite sides of the door frame plate 9 , and two ends of the central shaft 3 pass through the two circular holes 2 respectively. Bearings 14 are respectively clamped in the two circular holes, and the ends of the central shaft 3 are connected to the bearings 14 .

[0028] like Figures 4 - 5 As shown, the shaft of the central shaft 3 is provided with two steps 12, and the two steps 12 are respectively arranged near the two ends of the central shaft 3, and the steps 12 match the bearing 14, and the side of the bearing 14 away from the door frame plate 9 is connected to the door frame plate 9 through a fixing clip. Steps 12 are arranged at equidistant positions at both ends of the central shaft 3, so that the bearing 14 after installation will not slide into the central shaft 3, and the bearing 14 is stuck in the circular hole 2 set in the door frame plate 9, and a fixing clip is arranged on the outside of the bearing 14, so that each bearing 14 is firmly fixed on the door frame plate 9.

[0029] Example 4 The air flow control door device includes a central axis 3, the shaft body of the central axis 3 is provided with a hole 11 along its length direction, an air duct door 1 is passed through the hole 11, the air duct door 1 is connected to the central axis 3 through a bolt pin 4, a door frame plate 9 is provided on the edge of the air duct door 1, two ends of the central axis 3 respectively pass through the opposite sides of the door frame plate 9, one end of the central axis 3 is connected to a power part through a transmission unit, and the power part is connected to one side of the door frame plate 9.

[0030] The air duct door 1 includes steel plates 6 that are arranged opposite to each other. The edges of the two steel plates 6 are connected by side plates. A valve plate grid 5 is connected between the two steel plates 6. The two steel plates 6 pass through a gap 11. The central axis 3 is arranged in the middle of the steel plates 6. The two steel plates 6 are connected to the central axis 3 by bolt pins 4. Air holes 7 are opened on the plate surface of the steel plates 6.

[0031] Circular holes 2 are provided on opposite sides of the door frame plate 9 , and two ends of the central shaft 3 pass through the two circular holes 2 respectively. Bearings 14 are respectively clamped in the two circular holes, and the ends of the central shaft 3 are connected to the bearings 14 .

[0032] The shaft body of the central shaft 3 is provided with two steps 12, and the two steps 12 are respectively arranged near the two ends of the central shaft 3, and the steps 12 match with the bearing 14, and the side of the bearing 14 away from the door frame plate 9 is connected to the door frame plate 9 through a fixing clamp.

[0033] The transmission unit includes a curved arm 15, which is connected to one end of the central shaft 3, and the other end of the curved arm 15 away from the central shaft 3 is connected to the power member. The arrangement of the curved arm 15 ensures that when the power member applies horizontal thrust or pulling force to it, it has a certain force application angle on the central shaft 3, ensuring that the central shaft 3 can be driven to rotate.

[0034] Example 5 Airflow circulation control door device, including a central shaft 3. A pore 11 is provided along the length direction of the shaft body of the central shaft 3. A duct door 1 is inserted into the pore 11. The duct door 1 is connected to the central shaft 3 through a bolt pin 4. A door frame plate 9 is provided at the edge of the duct door 1. Both ends of the central shaft 3 respectively pass through opposite sides of the door frame plate 9. One end of the central shaft 3 is connected to a power member through a transmission unit, and the power member is connected to one side of the door frame plate 9.

[0035] The duct door 1 includes steel plates 6 arranged oppositely. The edges of the two steel plates 6 are connected through side plates. A valve plate grid 5 is connected between the two steel plates 6. The two steel plates 6 pass through the pore 11. The central shaft 3 is arranged in the middle of the steel plates 6. Both steel plates 6 are connected to the central shaft 3 through bolt pins 4. Air holes 7 are provided on the plate surfaces of the steel plates 6.

[0036] Both opposite sides of the door frame plate 9 are provided with round holes 2. Both ends of the central shaft 3 respectively pass through the two round holes 2. Bearings 14 are respectively clamped in the two round holes. The end of the central shaft 3 is connected to the bearing 14.

[0037] Two steps 12 are provided on the shaft body of the central shaft 3. The two steps 12 are respectively arranged close to both ends of the central shaft 3. The steps 12 are matched with the bearings 14. The side of the bearing 14 away from the door frame plate 9 is connected to the door frame plate 9 through a fixing clip.

[0038] The transmission unit includes a bent arm 15. The bent arm 15 is connected to one end of the central shaft 3. The end of the bent arm 15 away from the central shaft 3 is connected to the power member.

[0039] The power member includes a power cylinder 17. The output end of the power cylinder 17 is connected to the bent arm 15 through a connecting pin 16. A fixing seat 18 is connected to the bottom of the power cylinder 17. The fixing seat 18 is connected to the door frame plate 9 through bolts. Select one end of the central shaft 3 as the power end. The power end is arranged at the upper part in the horizontal direction of the door frame plate 9. The power end is connected to the power cylinder 17 through the bent arm 15. The bottom of the power cylinder 17 is connected to the fixing seat 18. The fixing seat 18 is fixed on the door frame plate 9 with bolts. Under the action of the power cylinder 17, the duct door 1 can be freely opened and closed.

[0040] Embodiment 6 Airflow circulation control door device, including a central shaft 3. A pore 11 is provided along the length direction of the shaft body of the central shaft 3. A duct door 1 is inserted into the pore 11. The duct door 1 is connected to the central shaft 3 through a bolt pin 4. A door frame plate 9 is provided at the edge of the duct door 1. Both ends of the central shaft 3 respectively pass through opposite sides of the door frame plate 9. One end of the central shaft 3 is connected to a power member through a transmission unit, and the power member is connected to one side of the door frame plate 9.

[0041] The air duct door 1 includes steel plates 6 arranged oppositely. The edges of the two steel plates 6 are connected by side plates. A valve plate grid 5 is connected between the two steel plates 6. The two steel plates 6 pass through the pores 11. The central shaft 3 is arranged in the middle of the steel plates 6. The two steel plates 6 are both connected to the central shaft 3 through bolt pins 4. Air holes 7 are formed on the plate surfaces of the steel plates 6.

[0042] Both opposite sides of the door frame plate 9 are provided with round holes 2. The two ends of the central shaft 3 respectively pass through the two round holes 2. Bearings 14 are respectively clamped in the two round holes. The end of the central shaft 3 is connected to the bearing 14.

[0043] Two steps 12 are formed on the shaft body of the central shaft 3. The two steps 12 are respectively arranged close to the two ends of the central shaft 3. The steps 12 are matched with the bearings 14. One side of the bearing 14 away from the door frame plate 9 is connected to the door frame plate 9 through a fixing clip.

[0044] The transmission unit includes a bent arm 15. The bent arm 15 is connected to one end of the central shaft 3. The end of the bent arm 15 away from the central shaft 3 is connected to a power component.

[0045] The power component includes a power cylinder 17. The output end of the power cylinder 17 is connected to the bent arm 15 through a connecting pin 16. The bottom of the power cylinder 17 is connected with a fixing seat 18. The fixing seat 18 is connected to the door frame plate 9 through bolts.

[0046] As Figure 6 shown, a baffle 13 is connected to the inner wall of the door frame plate 9. A sealing strip is connected to the side of the baffle 13 away from the door frame plate 9. The baffle 13 is arranged on one side of the central shaft 3. Inside the door frame plate 9, taking the widths of the two side edges of the door frame plate 9 as endpoints, two center points are respectively set. The two center points are connected and extended to form the center line of the inner closed loop of the frame. Taking the closed state of the door as the standard, taking the central shaft 3 as the left - right center dividing line of the inner wall of the door frame plate 9, at different positions in the front and back on the left and right sides of the air duct door 1, a baffle 13 is respectively set with the center line of the inner closed loop parallel to the inner wall of the door frame plate 9 as the reference point. The baffle 13 is welded to the door frame plate 9. A flexible sealing strip is inlaid on the baffle 13. The sealing strip is made of a flexible sealing material resistant to temperature and corrosion, ensuring that the service strength is doubled, and it is firm and reliable, with good sealing, stable operation without deformation, so that after the air duct door 1 is closed, it is in close contact with the sealing strip. Thus, the overall assembly of the double - layer horizontal air duct door is completed.

[0047] Embodiment 7 The control method of the air - flow circulation control door device is specifically implemented according to the following steps: Step 1. Connect the device completely and place it in the state of horizontal air - flow operation; Step 2. The power cylinder 17 pushes the bent arm 15, and drives the central shaft 3 to rotate through the bent arm 15; Step 3. The central shaft 3 drives the air duct door 1 to rotate. When the edge of the air duct door 1 contacts the sealing strip, the power end of the power cylinder stops running. At this time, the air duct door is closed. When the power end of the power cylinder contracts, the edge of the air duct door moves away from the sealing strip, thereby driving the air duct door to rotate in the opposite direction, so as to realize the cyclic full operation process.

[0048] The working principle of the air flow circulation control door device of the present invention is as follows: Place the device at the air inlet and outlet of the horizontal air duct of each compartment. The whole air duct door is a left-right rotary switch. The collector changes the traditional vertical flow direction of the air flow from top to bottom in each compartment to a natural horizontal flow mode of the air flow in each compartment. The power cylinder 17 drives the air duct door 1 to rotate through the central shaft 3. When the air source pressure of the power cylinder 17 is insufficient, the air duct door 1 can always be in the open state under the operation state of the induced draft fan air flow, ensuring the smooth passage of the air flow in each compartment.

[0049] The air flow circulation control door device of the present invention adopts the horizontal movable air duct control door technology, which changes the traditional air duct door that operates with an up-down lifting switch to a horizontal air duct door with a horizontal symmetry on the left and right around the center. The air flow changes from the traditional up-down vertical circulation to a horizontal natural circulation mode, so that the air duct door will not be closed due to insufficient air source pressure of the power cylinder or other abnormal operations, resulting in the interruption of the operating air flow, and then the production line dust cannot be collected and discharged non-compliance, forming an environmental incident.

Claims

1. An air flow control door device, characterized in that: The invention comprises a central shaft (3), the shaft of the central shaft (3) is provided with a hole (11) along its length direction, an air duct door (1) is passed through the hole (11), the air duct door (1) is connected to the central shaft (3) via a bolt pin (4), a door frame plate (9) is provided at the edge of the air duct door (1), two ends of the central shaft (3) respectively pass through two opposite sides of the door frame plate (9), one end of the central shaft (3) is connected to a power member via a transmission unit, and the power member is connected to one side of the door frame plate (9).

2. The airflow control door device according to claim 1, characterized in that: The air duct door (1) comprises steel plates (6) arranged opposite to each other, the edges of the two steel plates (6) being connected via side plates, a valve plate grid (5) being connected between the two steel plates (6), the two steel plates (6) passing through a pore (11), the central axis (3) being arranged in the middle of the steel plates (6), the two steel plates (6) being connected to the central axis (3) via bolt pins (4), and air holes (7) being provided on the plate surfaces of the steel plates (6).

3. The airflow control door device according to claim 1, characterized in that: Circular holes (2) are provided on two opposite sides of the door frame plate (9), and the two ends of the central shaft (3) pass through the two circular holes (2) respectively. Bearings (14) are respectively clamped in the two circular holes, and the ends of the central shaft (3) are connected to the bearings (14).

4. The airflow control door device according to claim 3, characterized in that: The shaft body of the central shaft (3) is provided with two steps (12), the two steps (12) being respectively arranged near the two ends of the central shaft (3), the steps (12) matching with the bearing (14), and the side of the bearing (14) away from the door frame plate (9) being connected to the door frame plate (9) via a fixing clamp.

5. The airflow control door device according to claim 1, characterized in that: The transmission unit comprises a bent arm (15), wherein the bent arm (15) is connected to one end of the central axis (3), and an end of the bent arm (15) away from the central axis (3) is connected to a power member.

6. The airflow control door device according to claim 5, characterized in that: The power member comprises a power cylinder (17), the output end of the power cylinder (17) is connected to the bent arm (15) via a connecting pin (16), and the power cylinder (17) is connected to the door frame plate (9).

7. The airflow control door device according to claim 6, characterized in that: The bottom of the power cylinder (17) is connected to a fixing seat (18), and the fixing seat (18) is connected to the door frame plate (9) via bolts.

8. The air flow control door device according to claim 1, characterized in that: The inner wall of the door frame plate (9) is connected to a baffle plate (13), a side of the baffle plate (13) away from the door frame plate (9) is connected to a sealing strip, and the baffle plate (13) is arranged on one side of the central axis (3).

9. The control method of the airflow control door device according to any one of claims 1 to 8, characterized in that: Follow the steps below to implement it: Step 1. Connect the device completely and put it in horizontal airflow operation state; Step 2. The power cylinder (17) pushes the bending arm (15), and drives the central shaft (3) to rotate through the bending arm (15); Step 3. The central shaft (3) drives the air duct door (1) to rotate. When the edge of the air duct door (1) contacts the sealing strip, the power end of the power cylinder (17) stops running, and the air duct door (1) is closed. When the power end of the power cylinder (17) contracts, the edge of the air duct door (1) moves away from the sealing strip, thereby driving the air duct door (1) to rotate in the opposite direction, thereby realizing a full reciprocating operation process.

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