Lodging-resistant wheat cultivating and screening device

Abstract

The invention discloses a lodging-resistant wheat cultivating and screening device, and belongs to the technical field of wheat cultivating equipment. The device comprises a frame body, a planting disc, an irrigation mechanism, a driving part, a shear-type connecting rod set and a spray head, and the driving part is used for driving the connecting rod set to stretch out and draw back in a shear mode; the motion module is used for driving the two irrigation mechanisms to move back and forth along the long edge of the planting plate; the ventilation mechanism comprises a lifting module, a same-position rod, a first ventilation pipe and a second ventilation pipe, the lifting module is fixed to the top of the frame body and can drive the same-position rod to ascend and descend in the height direction of the frame body, and the first ventilation pipe and the second ventilation pipe are fixed to the two ends of the same-position rod correspondingly and communicate with the exterior of the frame body and the interior of the frame body; the first ventilation pipe and the second ventilation pipe are each internally provided with a rotary vane set rotating under electric control, and the rotating directions of the rotary vane sets are kept consistent. The device can equivalently homogenize the seeding density, the moisture and the air volume of wheat cultivated in experiments, so that the lodging resistance of the wheat is enhanced, and the influence on other cultivation parameters is avoided.

Description

Technical Field

[0001] This invention relates to the field of wheat cultivation equipment technology, and more specifically, to a lodging-resistant wheat cultivation and screening device. Background Technology

[0002] Wheat lodging refers to the phenomenon where wheat plants, in the middle and later stages of growth, bend or break their stems from an upright position due to internal or external factors. Based on the location of the lodging, it can be divided into: root lodging: the root system is not firmly anchored in the soil, causing the entire plant to tilt or lie flat on the ground, often related to root development, soil conditions, and wind and rain; stem lodging: the stem bends or breaks at the base or middle, mainly related to the quality and structure of the stem. Lodging is one of the main factors restricting high, stable, and high-quality wheat yields, leading to a series of problems such as reduced yield, decreased quality, and harvesting difficulties.

[0003] Similarly, the experimental breeding of wheat also faces the problem of lodging. The breeding process requires accurate consideration of other breeding parameters of wheat (such as yield, uniformity, grain weight, etc.), which indirectly requires maintaining the lodging resistance of each wheat plant during the breeding process to avoid interference from unnecessary variables. The external environmental factors for lodging resistance are mainly sowing density, moisture, wind volume, etc.

[0004] To address these issues, we propose a lodging-resistant wheat breeding and screening device. Summary of the Invention

[0005] In view of the above-mentioned problems in the existing technology, the purpose of the present invention is to provide a lodging-resistant wheat breeding and screening device.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows: a lodging-resistant wheat breeding and screening device, comprising:

[0007] The frame includes an upper shelf and a lower shelf, and the outer side and top of the frame are transparent panels to allow light to pass through. The planting tray includes two symmetrically located on both sides of the lower shelf, and each planting tray contains multiple soil tubes laid at equal intervals. An irrigation mechanism is located between the two planting trays on the lower shelf. The irrigation mechanism includes two parts and corresponds to each planting tray. Each irrigation mechanism includes a drive unit, a scissor-type linkage group, and a nozzle. The nozzle is connected to an external water source and is fixed at the end of the linkage group. The drive unit is used to drive the linkage group to scissor-type extend and retract in the direction of the short side of the planting tray. A motion module is fixed at the center of the lower shelf, and the motion module is used to synchronously drive the two irrigation mechanisms to reciprocate along the long side of the planting tray; A ventilation mechanism is located on both sides of the upper shelf. The ventilation mechanism includes a lifting module, a positioning rod, a first ventilation pipe, and a second ventilation pipe. The lifting module is fixed to the top of the shelf and can drive the positioning rod to move up and down in the height direction of the shelf. The first ventilation pipe and the second ventilation pipe are respectively fixed to both ends of the positioning rod. Both are connected to the outside and inside of the shelf. The first ventilation pipe and the second ventilation pipe are equipped with electrically controlled rotating blade groups inside, and the rotation direction of the blade groups is consistent.

[0008] Furthermore, each of the planting trays includes a base plate, a water baffle plate, and a grid plate. The grid plate includes two grid plates, which are respectively vertically fixed on both sides of the short side of the planting tray. The water baffle plate is vertically fixed on the inner side of the long side of the planting tray and is integrated with the two grid plates. The base plate has multiple slots to separate the multiple soil cylinders. The top of the planting tray and the side facing away from the water baffle plate are open.

[0009] Furthermore, the driving component includes a housing, a servo motor, a first gear, a first rack, a hinge rod, a sliding rod, and a fixed channel steel. The servo motor is built-in and fixed in the housing. The output end of the servo motor is coaxially fixed with the first gear. The first rack is fixedly connected to the fixed channel steel. The first gear meshes with the first rack. The fixed channel steel is inserted and fixed in the housing. The hinge rod is vertically fixed to one end of the fixed channel steel. The sliding rod is horizontally fixed to the bottom of the hinge rod. The housing is slidably connected to the sliding rod.

[0010] Furthermore, the linkage assembly includes a limiting rod and a fork rod. The limiting rod is parallel to the short side of the planting tray and has a corresponding limiting groove in the same direction. The fork rods are arranged in pairs and include multiple sets. Each set of fork rods is crisscrossed by a pin, and the pin at the center of the intersection is slidably connected in the limiting groove. The outer end of the fork rod set farthest from the first rack is fixed to the nozzle.

[0011] Furthermore, the maximum extension length of the linkage assembly is not less than the width of the planting tray, and the minimum extension length is less than the spacing between the two planting trays.

[0012] Furthermore, the motion module includes a second gear, a second rack, and a slide rail. The slide rail is I-shaped, and its center is rotatably connected to the second gear. The second gear is servo-rotated. The second rack includes two racks that are symmetrical about the center of the first gear. The two second racks are slidably connected to both sides of the slide rail and mesh with both sides of the second gear. The length of the second rack corresponds to the long side of the planting tray. Each rack has a connecting platform fixed to its top. The top of the connecting platform extends vertically and is fixedly connected to the fixed channel steel.

[0013] Furthermore, the nozzle includes multiple nozzles that are equidistantly surrounded and fixed by angled discs. The angled discs are fixed to the outer end of the fork group furthest from the first rack. The angled discs are tilted. A photoelectric sensor for sensing the position of the nozzle is also fixed on the angled discs. The photoelectric sensor is electrically connected to the servo motor.

[0014] Furthermore, the lifting module includes a servo cylinder, a telescopic rod, and a fixing block. The servo cylinder passes through the top of the frame, and the output end of the servo cylinder is fixed to the telescopic rod through the fixing block. The telescopic rod is vertically fixed to the top of the frame, and the corresponding rod is fixedly sleeved on the outer wall of the servo cylinder.

[0015] Furthermore, each end of the corresponding rod is vertically fixed with a support frame, and each support frame is provided with multiple support holes at equal intervals. The first ventilation pipe and the second ventilation pipe are connected to multiple air outlets at one end of the corresponding support frame, and each air outlet is embedded in the support hole.

[0016] Furthermore, the blade assembly includes a servo-rotating eccentric wheel, blades, and a disc-shaped air inlet pipe. The upper end of the air inlet pipe is connected to the first ventilation pipe and the second ventilation pipe, and the lower end of the air inlet pipe is bent to allow air to enter and exit. The eccentric wheel is eccentrically positioned with respect to the air inlet pipe. One end of each blade is slidably connected to the circular groove, and the other end is hinged to the side of the eccentric wheel via a rocker arm. Multiple blades are arranged at equal intervals around the central circumference of the eccentric wheel.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention uses planting trays to equalize the sowing density of wheat, thereby avoiding lodging between adjacent wheat plants in the later stages of wheat production; (2) The present invention achieves the limited sliding of the box body on the sliding rod by the servo rotation of the first gear and the first rack. That is, the box body can drive one end of it that is hinged to the fork to slide along the sliding rod, while the other end of the fork is hinged to the fixed channel steel, thus realizing the scissor motion of multiple fork groups. The pin at the cross center of the fork itself is limited to slide in the limiting groove of the limiting rod, and finally realizes the linkage group to drive the nozzle to extend and retract along the short side of the planting tray. With the bidirectional operation of the motion module, the wheat in each planting tray is irrigated to ensure sufficient and uniform water. At the same time, the scissor mechanism also ensures that the wheat is not shaded. (3) When encountering continuous severe weather, and the indoor temperature and humidity are too high or too low, the present invention can circulate the air inside the frame through the ventilation mechanism to ensure the air volume required for the wheat cultivation process. Attached Figure Description

[0018] Figure 1 This is a front view of the anti-lodging device in this invention; Figure 2 This is an isometric structural diagram of the anti-collapse device in this invention; Figure 3 In this invention Figure 1 Sectional view along axis AA; Figure 4 In this invention Figure 1 A magnified view of a section at point A; Figure 5 This is a schematic diagram of the driving component in this invention; Figure 6 This is a schematic diagram of the internal structure of the vortex blade assembly in this invention.

[0019] In the diagram: 1. Frame; 101. Upper frame; 102. Lower frame; 2. Planting tray; 201. Soil cylinder; 202. Base plate; 203. Water baffle; 204. Grid plate; 205. Divider groove; 3. Irrigation mechanism; 31. Drive component; 311. Box body; 312. Servo motor; 313. First gear; 314. First rack; 315. Hinge rod; 316. Sliding rod; 317. Fixed channel steel; 32. Linkage assembly; 321. Limiting rod; 322. Fork rod; 323. Limiting groove; 324. Pin; 33. Sprayer 331. Head; 332. Angle plate; 333. Photoelectric sensor; 4. Motion module; 401. Second gear; 402. Second rack; 403. Slide rail; 404. Connecting platform; 5. Ventilation mechanism; 51. Lifting module; 511. Servo cylinder; 512. Telescopic rod; 513. Fixing block; 52. Corresponding rod; 53. First ventilation pipe; 54. Second ventilation pipe; 55. Rotary blade assembly; 551. Eccentric wheel; 552. Blade; 553. Air inlet pipe; 554. Swing rod; 56. Support frame; 57. Support hole; 58. Air outlet. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments.

[0021] like Figures 1-6 As shown, in this embodiment, a lodging-resistant wheat breeding and screening device includes, in terms of its overall structure: The frame 1 includes an upper shelf 101 and a lower shelf 102, and the outer side and top of the frame 1 are transparent panels to allow light to pass through. Planting trays 2 include two symmetrically located on both sides of the lower shelf 102, and each planting tray 2 has multiple soil tubes 201 laid at equal intervals. Irrigation mechanism 3 is located between the two planting trays 2 on the lower shelf 102. The irrigation mechanism 3 includes two parts and corresponds to each planting tray 2. Each irrigation mechanism 3 includes a drive member 31, a scissor-type linkage 32 and a nozzle 33. The nozzle 33 is connected to an external water source and is fixed at the end of the linkage 32. The drive member 31 is used to drive the linkage 32 to extend and retract in a scissor-like manner in the direction of the short side of the planting tray 2. The motion module 4 is fixed at the center of the lower shelf 102. The motion module 4 is used to synchronously drive the two irrigation mechanisms 3 to reciprocate along the long side of the planting tray 2. Ventilation mechanism 5 is located on both sides of the upper shelf 101. Ventilation mechanism 5 includes lifting module 51, corresponding rod 52, first ventilation pipe 53 and second ventilation pipe 54. Lifting module 51 is fixed to the top of the shelf 1 and can drive the corresponding rod 52 to rise and fall in the height direction of the shelf 1. The first ventilation pipe 53 and the second ventilation pipe 54 are respectively fixed to both ends of the corresponding rod 52. Both are connected to the outside and inside of the shelf 1. The first ventilation pipe 53 and the second ventilation pipe 54 are equipped with electrically controlled rotating blade group 55 inside, and the rotation direction of the blade group 55 is consistent.

[0022] Through the above structure, the lodging prevention device in this solution uniformizes the wheat sowing density using the planting tray 2. Specifically, as follows: Figure 2 As shown, each planting tray 2 includes a base plate 202, a water-retaining plate 203, and a grid plate 204. Two grid plates 204 are vertically fixed to both sides of the short side of the planting tray 2. The water-retaining plate 203 is vertically fixed to the inner side of the long side of the planting tray 2 and is integrated with the two grid plates 204. The base plate 202 has multiple slots 205 to separate the multiple soil cylinders 201. The top of the planting tray 2 and the side facing away from the water-retaining plate 203 are open. The water-retaining plate 203 prevents interference between the irrigation mechanisms 3 on both sides during operation. The grid plate 204 ensures the structural stability of the planting tray 2 and, after the transparent plate is installed on the frame 1, maximizes the light exposure area while maintaining structural stability. Similarly, the openings on the top and left side of the planting tray 2 are also open structures to ensure smooth ventilation and sufficient light.

[0023] Regarding the equalization of water volume during the irrigation process, in this embodiment, such as Figure 5As shown, the driving component 31 includes a housing 311, a servo motor 312, a first gear 313, a first rack 314, a hinge rod 315, a sliding rod 316, and a fixed channel steel 317. The servo motor 312 is built-in and fixed inside the housing 311. The output end of the servo motor 312 is coaxially fixed with the first gear 313. The first rack 314 is fixedly connected to the fixed channel steel 317. The first gear 313 meshes with the first rack 314. The fixed channel steel 317 is inserted and fixed inside the housing 311. The hinge rod 315 is vertically fixed to one end of the fixed channel steel 317. The sliding rod 316 is horizontally fixed to the bottom of the hinge rod 315. The housing 311 is slidably connected to the sliding rod 316.

[0024] Correspondingly, the linkage group 32 includes a limiting rod 321 and a fork 322. The limiting rod 321 is parallel to the short side of the planting tray 2 and has a corresponding limiting groove 323 in the same direction. The forks 322 are in pairs and include multiple groups. Each group of forks 322 is cross-arranged by pins 324, and the pins 324 at the center of the cross are slidably connected in the limiting groove 323. The outer end of the fork 322 group farthest from the first rack 314 is fixed to the nozzle 33.

[0025] Based on the aforementioned drive structure, after the servo motor 312 rotates, under the limiting action of the sliding rod 316, the meshing rotation of the first gear 313 and the first rack 314 can be converted into the limiting sliding of the box 311 on the sliding rod 316. That is, the box 311 can drive one end of it, which is hinged to the fork 322, to slide along the sliding rod 316, while the other end of the fork 322 is hinged to the fixed channel steel 317, thus realizing the scissor motion of multiple fork 322 groups. The pin 324 at the intersection center of the fork 322 is limited to sliding within the limiting groove 323 of the limiting rod 321, ultimately realizing the extension and retraction of the nozzle 33 along the short side of the planting tray 2 driven by the linkage group 32. In this embodiment, the maximum extension and retraction length of the linkage group 32 is not less than the width of the planting tray 2, and the minimum extension and retraction length is less than the interval width between the two planting trays 2, in order to meet the irrigation width position requirements of each soil cylinder 201.

[0026] Using this scissor-driven method, the overall drive structure can be concealed within the gaps of the planting tray 2 when not in use, avoiding shading of the wheat above, resulting in a more reasonable layout.

[0027] Similarly, such as Figure 1 and Figure 2As shown, the motion module 4 includes a second gear 401, a second rack 402, and a slide rail 403. The slide rail 403 is I-shaped, and its center is rotatably connected to the second gear 401. The second gear 401 is servo-rotated. The second rack 402 includes two racks, which are symmetrical about the center of the first gear 313. The two racks 402 are slidably connected to both sides of the slide rail 403 and mesh with both sides of the second gear 401. The length of the second rack 402 corresponds to the long side of the planting tray 2. A connecting platform 404 is fixed to the top of each rack. The top of the connecting platform 404 extends vertically and is fixedly connected to the fixed channel steel 317.

[0028] After the second gear 401 rotates, the two second racks 402 can move relative to each other under meshing action, which can meet the length requirements of the soil cylinder 201 irrigation process. In conjunction with the aforementioned drive structure, irrigation can be achieved for each soil channel in the planting tray 2. The nozzle 33 shifting process is linear, which indirectly ensures the homogenization of water and ensures that the water has the least impact on lodging during the wheat seed cultivation process.

[0029] In this embodiment, as Figure 5 As shown, the nozzle 33 includes multiple nozzles that are equidistantly surrounded and fixed by angle disks 331. The angle disks 331 are fixed to the outer end of the fork 322 group that is furthest from the first rack 314. The angle disks 331 are inclined. A photoelectric sensor 332 for sensing the position of the nozzle 33 is also fixed on the angle disks 331. The photoelectric sensor 332 is electrically connected to the servo motor 312.

[0030] The tilting angle plate 331 can keep the water outlet angle of the nozzle 33 at an upward angle, so that the water will not directly rush into the soil cylinder 201, but fall in an arc, avoiding water waste. The photoelectric sensor 332 is mainly used to detect the position of the nozzle 33. After being electrically connected to the servo motor 312, it can be used with the PLC to control the degree of scissor extension of the linkage group 32.

[0031] Regarding airflow regulation, in the event of continuous severe weather or excessively high or low indoor temperature and humidity, the ventilation mechanism 5 can be used to circulate the air inside the frame 1, ensuring the airflow required for the wheat cultivation process. Specifically, for example... Figure 1 and Figure 2As shown, the lifting module 51 includes a servo cylinder 511, a telescopic rod 512, and a fixing block 513. The servo cylinder 511 passes through the top of the frame 1, and the output end of the servo cylinder 511 is fixed to the telescopic rod 512 through the fixing block 513. The telescopic rod 512 is vertically fixed to the top of the frame 1, and the corresponding rod 52 is fixedly sleeved on the outer wall of the servo cylinder 511. Support frames 56 are also vertically fixed at both ends of the corresponding rod 52. Each support frame 56 has multiple support holes 57 equidistantly opened. The first ventilation pipe 53 and the second ventilation pipe 54 are each connected to multiple air outlets 58 at one end of the corresponding support frame 56, and each air outlet 58 is embedded in the corresponding support hole 57.

[0032] Air is supplied through the first ventilation duct 53 connecting the interior and the frame 1, and then air is supplied through the second ventilation duct 54 connecting the interior and the exterior of the frame 1, achieving external air circulation. Specifically, regarding the air intake process, as follows... Figure 6 As shown, the blade assembly 55 includes a servo-rotating eccentric wheel 551, blades 552, and a disc-shaped air inlet pipe 553. The upper end of the air inlet pipe 553 is connected to the first ventilation pipe 53 and the second ventilation pipe 54 respectively. The lower end of the air inlet pipe 553 is bent to allow air to enter and exit. The eccentric wheel 551 is eccentrically positioned with respect to the air inlet pipe 553. One end of each blade 552 is slidably connected to the circular groove, and the other end is hinged to the side of the eccentric wheel 551 through a rocker arm 554. Multiple blades 552 are arranged at equal intervals around the central circumference of the eccentric wheel 551.

[0033] After the eccentric wheel 551 rotates, it can drive the three blades 552 to slide along the circular groove through the three rocker arms 554. In conjunction with the external atmospheric pressure, it can realize the reciprocating positive and negative pressure in the air inlet pipe 553, thereby realizing air intake. The air outlet process is the same, and will not be described in detail here. The eccentric design of the eccentric wheel 551 also maximizes the width of the blades 552, further increasing the air volume intake and exhaust volume to meet the subsequent cultivation needs.

[0034] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A lodging-resistant wheat breeding and screening device, characterized in that, include: The frame includes an upper shelf and a lower shelf, and the outer side and top of the frame are transparent panels to allow light to pass through. The planting tray includes two symmetrically located on both sides of the lower shelf, and each planting tray contains multiple soil tubes laid at equal intervals. An irrigation mechanism is located between the two planting trays on the lower shelf. The irrigation mechanism includes two parts and corresponds to each planting tray. Each irrigation mechanism includes a drive unit, a scissor-type linkage group, and a nozzle. The nozzle is connected to an external water source and is fixed at the end of the linkage group. The drive unit is used to drive the linkage group to scissor-type extend and retract in the direction of the short side of the planting tray. A motion module is fixed at the center of the lower shelf, and the motion module is used to synchronously drive the two irrigation mechanisms to reciprocate along the long side of the planting tray; A ventilation mechanism is located on both sides of the upper shelf. The ventilation mechanism includes a lifting module, a positioning rod, a first ventilation pipe, and a second ventilation pipe. The lifting module is fixed to the top of the shelf and can drive the positioning rod to move up and down in the height direction of the shelf. The first ventilation pipe and the second ventilation pipe are respectively fixed to both ends of the positioning rod. Both are connected to the outside and inside of the shelf. The first ventilation pipe and the second ventilation pipe are equipped with electrically controlled rotating blade groups inside, and the rotation direction of the blade groups is consistent.

2. The lodging-resistant wheat breeding and screening device according to claim 1, characterized in that: Each planting tray includes a base plate, a water baffle plate, and a grid plate. The grid plate includes two grid plates, which are vertically fixed on both sides of the short side of the planting tray. The water baffle plate is vertically fixed on the inner side of the long side of the planting tray and is integrated with the two grid plates. The base plate has multiple slots to separate the multiple soil cylinders. The top of the planting tray and the side facing away from the water baffle plate are open.

3. The lodging-resistant wheat breeding and screening device according to claim 1, characterized in that: The driving component includes a housing, a servo motor, a first gear, a first rack, a hinge rod, a sliding rod, and a fixed channel steel. The servo motor is built into and fixed within the housing. The output end of the servo motor is coaxially fixed with the first gear. The first rack is fixedly connected to the fixed channel steel, and the first gear meshes with the first rack. The fixed channel steel is inserted and fixed within the housing. The hinge rod is vertically fixed to one end of the fixed channel steel. The sliding rod is horizontally fixed to the bottom of the hinge rod. The housing is slidably connected to the sliding rod.

4. The lodging-resistant wheat breeding and screening device according to claim 3, characterized in that: The linkage assembly includes a limiting rod and a fork rod. The limiting rod is parallel to the short side of the planting tray and has a corresponding limiting groove in the same direction. The forks rods are arranged in pairs and include multiple sets. Each set of forks rods is arranged crosswise by a pin, and the pin at the center of the crosswise arrangement is slidably connected in the limiting groove. The outer end of the fork rod set farthest from the first rack is fixed to the nozzle.

5. The lodging-resistant wheat breeding and screening device according to claim 4, characterized in that: The maximum extension length of the linkage assembly is not less than the width of the planting tray, and the minimum extension length is less than the spacing between the two planting trays.

6. The lodging-resistant wheat breeding and screening device according to claim 4, characterized in that: The motion module includes a second gear, a second rack, and a slide rail. The slide rail is I-shaped and its center is rotatably connected to the second gear, which is servo-driven. The second rack includes two racks that are symmetrical about the center of the first gear. The two racks are slidably connected to both sides of the slide rail and mesh with both sides of the second gear. The length of the second rack corresponds to the long side of the planting tray. Each rack has a connecting platform fixed to its top, and the top of the connecting platform extends vertically and is fixedly connected to the fixed channel steel.

7. The lodging-resistant wheat breeding and screening device according to claim 4, characterized in that: The nozzles include multiple nozzles that are equidistantly surrounded and fixed by angled disks. The angled disks are fixed to the outer end of the fork group farthest from the first rack. The angled disks are tilted. A photoelectric sensor for sensing the position of the nozzles is also fixed on the angled disks. The photoelectric sensor is electrically connected to the servo motor.

8. The lodging-resistant wheat breeding and screening device according to claim 1, characterized in that: The lifting module includes a servo cylinder, a telescopic rod, and a fixing block. The servo cylinder passes through the top of the frame, and the output end of the servo cylinder is fixed to the telescopic rod through the fixing block. The telescopic rod is vertically fixed to the top of the frame, and the corresponding rod is fixedly sleeved on the outer wall of the servo cylinder.

9. The lodging-resistant wheat breeding and screening device according to claim 8, characterized in that: Both ends of the corresponding rod are vertically fixed with support frames. Each support frame has multiple support holes at equal intervals. The first ventilation pipe and the second ventilation pipe are connected to multiple air outlets at one end of the corresponding support frame. Each air outlet is embedded in the support hole.

10. The lodging-resistant wheat breeding and screening device according to claim 9, characterized in that: The blade assembly includes a servo-rotated eccentric wheel, blades, and a disc-shaped air inlet pipe. The upper end of the air inlet pipe is connected to the first ventilation pipe and the second ventilation pipe. The lower end of the air inlet pipe is bent to allow air to enter and exit. The eccentric wheel is eccentrically positioned with respect to the air inlet pipe. One end of each blade is slidably connected to the circular groove, and the other end is hinged to the side of the eccentric wheel via a swing arm. Multiple blades are arranged at equal intervals around the central circumference of the eccentric wheel.

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