Material flow directional loading device with synchronous feeding spoon and belt speed

Abstract

The invention relates to the technical field of belt feeders, and provides a material flow directional loading device with synchronous feeding spoon and belt speed, the material flow directional loading device comprises a belt feeder and a feeding mechanism arranged on the belt feeder, the belt feeder comprises: a frame; the driving unit is arranged on the outer side of the rack; the material conveying assembly is arranged on the inner side of the rack; the transmission assembly can be driven by the driving unit to drive the material conveying assembly to stably convey materials; operation of the belt is driven by the driving unit through the first guide roller and the second guide roller (conveying assembly). Meanwhile, a first fluted disc is fixed to one end of the second guide roller and meshed with a second fluted disc at one end of a rotating shaft in the material shifting assembly, linkage transmission of the material conveying assembly and the material shifting assembly is formed, and by designing the transmission ratio of the first fluted disc to the second fluted disc, it is ensured that when the materials are pushed to the second guide plate by the material shifting plate and guided out, the speed of the materials is completely consistent with the running speed of a belt; and relative friction and collision are eliminated.

Description

Technical Field

[0001] This invention relates to the field of belt feeder technology, specifically to a material flow directional loading device that synchronizes the feeding scoop with the belt speed. Background Technology

[0002] Bulk materials (such as granular items) are typically transported by belt conveyor. During the transport process, belt transfers frequently occur, changing the direction and angle of the material's movement. When bulk materials are transferred from one conveyor belt to another, they fall freely and uncontrollably, causing severe impacts on the belts and resulting in belt damage. This also generates internal induced drafts, leading to significant dust emissions. This causes air pollution in the processing workshop, and the generated dust can even pose safety hazards.

[0003] A search revealed that CN210102841U discloses a streamlined feeder for a belt conveyor, comprising a bottom plate, a top plate, and feeder side plates. The feeder side plates are disposed along the length of the bottom plate on both sides of the bottom plate. The top plate is disposed on the top of the feeder side plates to form a tubular body. The bottom plate is a curved plate that is concave along its length. The body comprises a feeding section, a transition section, and a dust suppression section connected in sequence. A baffle is disposed at the front end of the dust suppression section, and the discharge port of the dust suppression section is disposed at its bottom.

[0004] This technology allows materials to enter the feed section of the streamlined feed scoop of the belt conveyor, impacting the inner walls of the feed section and the inner walls of the arc-shaped transition section. This controls and changes the material's speed, as well as the impact angle of the material against the inner wall of the streamlined feed scoop. The material then enters the dust suppression section, and from the discharge port at the bottom of the dust suppression section, it reaches the conveyor belt at a relatively low speed relative to its initial speed. This ensures that the material is transferred from the streamlined feed scoop to the conveyor belt with a small impact force and a suitable transition angle. However, because the material speed is much lower than the belt's running speed, there is a relative speed difference between the material and the belt, which can easily lead to friction and collision damage. Summary of the Invention

[0005] This invention proposes a material flow directional loading device that synchronizes the feeding spoon with the belt speed, which solves the problem of friction and collision damage caused by the relative speed difference between the material and the belt in the prior art.

[0006] The technical solution of the present invention is as follows: A material flow directional loading device with a feeding scoop synchronized with the belt speed, comprising a belt feeder and a feeding mechanism disposed on the belt feeder, wherein the belt feeder comprises:

[0007] frame;

[0008] The drive unit is located on the outside of the frame;

[0009] The material conveying assembly is located inside the frame;

[0010] The transmission component, driven by the drive unit, can stably transport materials through the material conveying component.

[0011] The feeding mechanism includes:

[0012] The feeding spoon is fixed above the machine frame;

[0013] The material guiding component is located inside the feeding spoon;

[0014] The feeding assembly can drive the material guided by the feeding assembly to be loaded onto the conveying assembly at the same speed and in the same direction under the transmission of the transmission assembly;

[0015] The dust collection component, located on the outside of the feeding scoop, is capable of absorbing the dust generated when feeding materials to the conveying component.

[0016] Preferably, the feeding assembly includes a first guide roller, a second guide roller, and a belt. The first guide roller and the second guide roller are located at both ends of the frame and are rotatably connected to the frame. The belt wraps around the first guide roller and the second guide roller. One end of the first guide roller is fixed to the output shaft of the drive unit, and one end of the second guide roller is fixed with a first toothed disc for driving the feeding assembly to operate.

[0017] Preferably, the transmission assembly includes a first synchronous pulley, a second synchronous pulley, and a synchronous belt. The first synchronous pulley is fixed to one end of a first guide roller, and the second synchronous pulley is fixed to one end of a second guide roller. The first synchronous pulley and the second synchronous pulley are synchronously driven by the synchronous belt.

[0018] Preferably, the feeding spoon includes two side plates that are parallel to each other on both sides of the feeding assembly. A tail plate is fixed to the tail of the two side plates, a top plate is fixed to the top of the two side plates, and a support beam is fixed to the outer side of the two side plates, and the support beam is fixed to the frame.

[0019] Preferably, the material guiding assembly includes a first arc-shaped plate and a second arc-shaped plate, both of which are fixed between two side plates. A first material guiding plate is fixed to the top of the first arc-shaped plate, the top of the second arc-shaped plate is fixed to the tail plate, and a second material guiding plate is fixed to the bottom of the second arc-shaped plate. A discharge gap is left between the first arc-shaped plate and the second material guiding plate, and a curtain is fixed to the bottom of the first arc-shaped plate.

[0020] Preferably, both the first guide plate and the tail plate are inclined, and the inclination directions of the first guide plate and the tail plate are opposite.

[0021] Preferably, the second guide plate is tangent to the second arc-shaped plate, the second guide plate is parallel to the conveying direction of the belt, and a dust suction gap is left between the second guide plate and the upper surface of the belt.

[0022] Preferably, the feeding assembly includes a rotating shaft, which is rotatably connected to the feeding spoon. The rotating shaft is concentrically positioned at the center of the first arc plate and the second arc plate. A plurality of radially arranged feeding plates are uniformly fixed between the first arc plate and the second arc plate. One end of the rotating shaft is fixed with a second toothed disc that meshes with the first toothed disc.

[0023] Preferably, the linear velocity of the belt at the top of the second guide roller is Va, the linear velocity of the feeding plate at the bottom of the second arc-shaped plate is Vb, and the transmission ratio between the first toothed disc and the second toothed disc satisfies Va equal to Vb.

[0024] Preferably, the dust collection assembly includes a fan hood, which is fixed to the outside of the tail plate and forms an air duct with the tail plate and two side plates. The fan hood has several through holes communicating with the air duct, and a fan is installed in the through holes. A partition is fixed inside the fan hood, and a baffle is hinged above the partition. When the baffle is not subjected to wind force, it abuts against the second arc-shaped plate to close the air duct. When the baffle is subjected to wind force, it opens the air duct. A collection groove is installed at the bottom of the fan hood and the partition.

[0025] The working principle and beneficial effects of this invention are as follows:

[0026] 1. The belt of this invention is driven by a drive unit through a first guide roller and a second guide roller (material conveying assembly); at the same time, a first toothed disc is fixed at one end of the second guide roller, which meshes with a second toothed disc at one end of the rotating shaft of the feeding assembly, forming a linkage transmission between the "material conveying assembly and the feeding assembly". By designing the transmission ratio between the first toothed disc and the second toothed disc, it is ensured that when the material is pushed to the second guide plate by the feeding plate and discharged, its speed is completely consistent with the belt running speed, eliminating relative friction and collision. Through mechanical transmission design, this invention makes the speed at which the feeding assembly discharges material completely match the belt running speed, solving the problem of "friction and collision damage caused by relative speed between material and belt" in traditional feeding.

[0027] 2. The material guiding component of this invention includes a first arc-shaped plate and a second arc-shaped plate, both concentrically arranged (the center of the arc coincides with the rotating shaft of the feeding component), forming an arc-shaped material guiding channel. Under the push of the feeding plate, the material moves stably along the arc-shaped channel, avoiding directional deviation. A second guiding plate is fixed to the bottom of the second arc-shaped plate, and the second guiding plate is tangent to the second arc-shaped plate and parallel to the conveyor belt's transport direction. This design ensures that when the material is discharged through the second guiding plate, its movement direction is completely consistent with the belt's running direction, achieving "directional loading." This invention, through the special structural design of the material guiding component, achieves stable loading of material onto the belt along a fixed direction, avoiding the problems of "material deviation and scattering" in traditional feeding methods.

[0028] 3. The dust collection component of this invention forms a closed air duct by enclosing the hood, tail plate, and side plate of the feeding scoop. At the same time, a "dust collection gap" is left between the second guide plate and the belt surface. Dust generated during feeding can enter the air duct through this gap. A baffle is hinged above the partition inside the hood. When the fan is not working, the baffle presses against the second arc plate due to its own weight, closing the air duct (preventing external impurities from entering). When the fan starts and generates suction, the baffle is pushed open by the airflow, the air duct opens, and dust is sucked into the hood through the air duct. A filter screen is installed in the through hole of the hood to intercept the sucked dust. The dust falls to the collection tank at the bottom due to gravity. Regular cleaning of the collection tank can complete the dust treatment. This invention designs a dust collection system with an automatic switch function, which only starts dust collection when feeding. It can efficiently collect dust and reduce dust diffusion when not working, solving the problem of dust easily generated when feeding material from the traditional feeding scoop to the conveyor belt.

[0029] 4. The drive unit of this invention serves as the sole power source, directly driving the belt through the first guide roller. Simultaneously, the first guide roller drives the second guide roller to rotate synchronously through the transmission assembly of "first synchronous pulley-synchronous belt-second synchronous pulley". The rotation of the second guide roller is transmitted to the rotating shaft of the feeding assembly through the meshing of "first toothed disc-second toothed disc", so that the rotation of the feeding plate is completely linked with the operation of the belt. Through the synchronous transmission design, the feeding assembly (belt) and the feeding assembly share the same power source, ensuring that their operating rhythms are completely matched, avoiding the asynchrony problem caused by traditional "separate drives". Attached Figure Description

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 This is a schematic diagram of the overall structure of a material flow directional loading device that synchronizes the feeding spoon and belt speed according to the present invention.

[0032] Figure 2 This is a schematic diagram of the overall structure of the material flow directional loading device that synchronizes the feeding spoon and belt speed according to the present invention from another perspective.

[0033] Figure 3 This is a schematic diagram of the belt feeder structure proposed in this invention;

[0034] Figure 4 This is a schematic diagram of the feeding mechanism structure proposed in this invention;

[0035] Figure 5 This is a schematic cross-sectional view of the feeding mechanism proposed in this invention;

[0036] Figure 6 for Figure 5 Enlarged diagram of point A in the middle.

[0037] In the diagram: 1. Belt feeder; 11. Frame; 12. Drive unit; 13. Transmission assembly; 131. First synchronous pulley; 132. Second synchronous pulley; 133. Synchronous belt; 14. Conveying assembly; 141. First guide roller; 142. Second guide roller; 143. Belt; 144. First gear disc; 2. Feeding mechanism; 21. Feeding scoop; 211. Side plate; 212. Tail plate; 213. Top plate; 214. Support beam; 22, material guiding assembly; 221, first material guiding plate; 222, first arc-shaped plate; 223, second arc-shaped plate; 224, second material guiding plate; 225, curtain; 23, dust collection assembly; 231, fan hood; 232, through hole; 233, fan; 234, partition; 235, baffle; 236, collection trough; 24, material feeding assembly; 241, rotating shaft; 242, material feeding plate; 243, second gear disc. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figure 1 , Figure 2 and Figure 3 This invention discloses a material flow directional loading device that synchronizes the feeding spoon with the belt speed, including a belt feeder 1 and a feeding mechanism 2 disposed on the belt feeder 1. The belt feeder 1 includes a frame 11, a drive unit 12, a transmission component 13, and a conveying component 14, wherein the drive unit 12 is disposed on the outside of the frame 11 and is composed of a motor and a gearbox.

[0040] The material conveying assembly 14 is disposed inside the frame 11. The material conveying assembly 14 includes a first guide roller 141, a second guide roller 142 and a belt 143. The first guide roller 141 and the second guide roller 142 are respectively located at both ends of the frame 11 and are rotatably connected to the frame 11. The belt 143 is wrapped around the first guide roller 141 and the second guide roller 142. One end of the first guide roller 141 is fixed to the output shaft of the drive unit 12, and one end of the second guide roller 142 is fixed with a first toothed disc 144 for driving the material feeding assembly 24 to rotate.

[0041] The transmission assembly 13 can drive the material conveying assembly 14 to transport materials stably under the drive of the drive unit 12. The transmission assembly 13 includes a first synchronous pulley 131, a second synchronous pulley 132 and a synchronous belt 133. The first synchronous pulley 131 is fixed to one end of the first guide roller 141 and the second synchronous pulley 132 is fixed to one end of the second guide roller 142. The first synchronous pulley 131 and the second synchronous pulley 132 are synchronously driven by the synchronous belt 133. The operation of the belt 143 is driven by the drive unit 12 through the first guide roller 141 and the second guide roller 142.

[0042] Please see Figure 4 and Figure 5 The feeding mechanism 2 includes a feeding spoon 21, a guiding assembly 22, a dust collection assembly 23, and a feeding assembly 24. The feeding spoon 21 is fixed above the frame 11. The feeding spoon 21 includes two side plates 211 that are parallel to each other on both sides of the feeding assembly 14. A tail plate 212 is fixed to the tail of the two side plates 211, and a top plate 213 is fixed to the top of the two side plates 211. A support beam 214 is fixed to the outer side of the two side plates 211, and the support beam 214 is fixed to the frame 11.

[0043] The material guiding assembly 22 is disposed inside the feeding spoon 21. The material guiding assembly 22 includes a first arc-shaped plate 222 and a second arc-shaped plate 223. Both the first arc-shaped plate 222 and the second arc-shaped plate 223 are fixed between two side plates 211. The top of the first arc-shaped plate 222 is fixed with the first material guiding plate 221, the top of the second arc-shaped plate 223 is fixed with the tail plate 212, and the bottom of the second arc-shaped plate 223 is fixed with the second material guiding plate 224. A discharge gap is left between the first arc-shaped plate 222 and the second material guiding plate 224. The bottom of the first arc-shaped plate 222 is fixed. A curtain 225 is provided to prevent splashing of materials during movement within the arc-shaped channel, helping to maintain the directional path and ensuring uniform material distribution. The first guide plate 221 and the tail plate 212 are both inclined, with opposite inclination directions. The second guide plate 224 is tangent to the second arc-shaped plate 223, parallel to the conveying direction of the belt 143, and has a dust-collecting gap between it and the upper surface of the belt 143. The first arc-shaped plate 222 and the second arc-shaped plate 223 are concentrically arranged, forming an arc-shaped material guiding channel. Under the push of the feeding assembly 24, the material moves stably along the arc-shaped channel, preventing directional deviation. The design of the second arc-shaped plate 223 ensures that the material's movement direction is completely consistent with the belt 143's running direction when discharged through the second guide plate 224, achieving "directional loading."

[0044] Please see Figure 5 and Figure 6The feeding assembly 24, driven by the transmission assembly 13, can cause the material guided by the guiding assembly 22 to be loaded onto the conveying assembly 14 at the same speed and direction. The feeding assembly 24 includes a rotating shaft 241, which is rotatably connected to the feeding spoon 21. The rotating shaft 241 is concentrically located at the center of the first arc plate 222 and the second arc plate 223. A plurality of radially arranged feeding plates 242 are uniformly fixed between the first arc plate 222 and the second arc plate 223. One end of the rotating shaft 241 is fixed to a first toothed disc. The second toothed disc 243 meshes with the belt 143. The linear velocity of the belt 143 at the top of the second guide roller 142 is Va, and the linear velocity of the feeding plate 242 at the bottom of the second arc plate 223 is Vb. The transmission ratio between the first toothed disc 144 and the second toothed disc 243 satisfies Va equal to Vb. By designing the transmission ratio between the first toothed disc 144 and the second toothed disc 243, it is ensured that when the material is pushed to the second guide plate 224 by the feeding plate 242 and discharged, its speed is completely consistent with the running speed of the belt 143, thus eliminating relative friction and collision.

[0045] The dust collection component 23 is located outside the feeding scoop 21 and can absorb the dust generated when feeding the material to the feeding component 14. The dust collection component 23 includes a hood 231, which is fixed to the outside of the tail plate 212 and forms an air duct with the tail plate 212 and the two side plates 211. The hood 231 has several through holes 232 communicating with the air duct, and a fan 233 is installed in the through holes 232. A filter screen is installed at the inner end of the through holes 232 to intercept dust. A partition 234 is fixed inside the hood 231, and a baffle 235 is hinged above the partition 234. When the baffle 235 is not subjected to wind force, it abuts against the second arc-shaped plate 223 and closes the air duct. When plate 235 is subjected to wind force, the air duct opens. The bottom of the hood 231 and the partition plate 234 is equipped with a collection trough 236. Dust generated during feeding can enter the air duct through this gap. When the fan 233 is not working, the baffle 235 presses against the second arc plate 223 due to its own weight, closing the air duct to prevent dust from spreading. When the fan 233 starts and generates suction, the baffle 235 is pushed open by the airflow, the air duct opens, and dust is sucked into the hood 231 through the air duct. The through hole 232 of the hood 231 is equipped with a filter screen, which can intercept the sucked dust. The dust falls to the collection trough 236 at the bottom due to gravity. Regularly cleaning the collection trough 236 can complete the dust treatment.

[0046] The working principle and specific process of this invention are as follows: The drive unit 12 drives the first guide roller 141 to rotate. The first synchronous pulley 131 at one end of the first guide roller 141 and the second synchronous pulley 132 at one end of the second guide roller 142 achieve synchronous operation through the transmission of the synchronous belt 133, thereby enabling the belt 143 to stably transport materials between the first guide roller 141 and the second guide roller 142. During this process, the first toothed disc 144 and the second toothed disc 243 at the other end of the second guide roller 142 drive the rotating shaft 241 to rotate inside the feeding scoop 21. The material guided by the first guide plate 221 and the tail plate 212 is then guided by the material pusher plate 242 outside the rotating shaft 241. Figure 5 Turn the dial clockwise as shown. (See reference) Figure 3 and Figure 6 The linear velocity of the belt 143 at the top of the second guide roller 142 is Va, and the linear velocity of the pusher plate 242 at the bottom of the second arc plate 223 is Vb. Since the transmission ratio of the first toothed disc 144 and the second toothed disc 243 satisfies Va equal to Vb, and the second guide plate 224 is tangent to the second arc plate 223, the speed at which the material is pushed out by the pusher plate 242 can be approximately matched with the feeding speed of the belt 143 when it is running. This reduces the relative friction between the material and the belt 143 when feeding. In addition, the parallel design of the second guide plate 224 and the belt 143 in the material conveying direction can alleviate the collision between the material and the belt 143 when it falls, thereby protecting the belt 143, preventing it from being damaged, and extending the service life of the belt 143.

[0047] A dust-collecting gap is left between the second guide plate 224 and the upper surface of the belt 143. The blower 233 on the hood 231 generates an outward airflow, which draws the dust generated during feeding through the air duct. The baffle 235 rotates and opens under the action of the airflow, allowing the dust to enter the hood 231. The dust then falls into the collection tank 236 below after being intercepted by the filter screen at the inner port of the through hole 232. The collection tank 236 can be cleaned periodically.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A material flow directional loading device with a feeding scoop synchronized with the belt speed, comprising a belt feeder (1) and a feeding mechanism (2) disposed on the belt feeder (1), characterized in that, The belt feeder (1) includes: Rack (11); The drive unit (12) is located on the outside of the frame (11); The material conveying assembly (14) is located inside the frame (11); The transmission component (13) can drive the material conveying component (14) to transport materials stably under the drive of the drive unit (12); The feeding mechanism (2) includes: The feeding spoon (21) is fixed above the frame (11); The material guiding component (22) is located inside the feeding spoon (21); The feeding assembly (24) can drive the material guided by the guiding assembly (22) to be loaded onto the conveying assembly (14) at the same speed and direction under the transmission of the transmission assembly (13); The dust collection component (23) is located on the outside of the feeding spoon (21) and can absorb the dust generated when feeding the material to the feeding component (14).

2. The material flow directional loading device with feeding spoon and belt speed synchronized according to claim 1, characterized in that, The feeding assembly (14) includes a first guide roller (141), a second guide roller (142), and a belt (143). The first guide roller (141) and the second guide roller (142) are located at both ends of the frame (11) and are rotatably connected to the frame (11). The belt (143) is wrapped around the first guide roller (141) and the second guide roller (142). One end of the first guide roller (141) is fixed to the output shaft of the drive unit (12), and one end of the second guide roller (142) is fixed with a first toothed disc (144) for driving the feeding assembly (24) to operate.

3. The material flow directional loading device with feeding spoon and belt speed synchronized according to claim 2, characterized in that, The transmission assembly (13) includes a first synchronous pulley (131), a second synchronous pulley (132), and a synchronous belt (133). The first synchronous pulley (131) is fixed to one end of the first guide roller (141), and the second synchronous pulley (132) is fixed to one end of the second guide roller (142). The first synchronous pulley (131) and the second synchronous pulley (132) are synchronously driven by the synchronous belt (133).

4. The material flow directional loading device with feeding spoon and belt speed synchronized according to claim 2, characterized in that, The feeding spoon (21) includes two side plates (211) that are parallel to each other on both sides of the feeding assembly (14). The tail plate (212) is fixed to the tail of the two side plates (211), the top plate (213) is fixed to the top of the two side plates (211), and the support beam (214) is fixed to the outer side of the two side plates (211), and the support beam (214) is fixed to the frame (11).

5. The material flow directional loading device with feeding spoon and belt speed synchronized according to claim 4, characterized in that, The material guiding assembly (22) includes a first arc plate (222) and a second arc plate (223). The first arc plate (222) and the second arc plate (223) are both fixed between two side plates (211). The top of the first arc plate (222) is fixed with a first guide plate (221). The top of the second arc plate (223) is fixed with a tail plate (212). The bottom of the second arc plate (223) is fixed with a second guide plate (224). There is a discharge gap between the first arc plate (222) and the second guide plate (224). The bottom of the first arc plate (222) is fixed with a curtain (225).

6. The material flow directional loading device with feeding spoon and belt speed synchronized according to claim 5, characterized in that, The first guide plate (221) and the tail plate (212) are both inclined, and the inclination directions of the first guide plate (221) and the tail plate (212) are opposite.

7. A material flow directional loading device with a feeding scoop and belt speed synchronized according to claim 5, characterized in that, The second guide plate (224) is tangent to the second arc plate (223), the second guide plate (224) is parallel to the conveying direction of the belt (143), and a dust suction gap is left between the second guide plate (224) and the upper surface of the belt (143).

8. The material flow directional loading device with feeding spoon and belt speed synchronized according to claim 5, characterized in that, The feeding assembly (24) includes a rotating shaft (241), which is rotatably connected to the feeding spoon (21). The rotating shaft (241) is concentrically arranged at the center of the first arc plate (222) and the second arc plate (223). A plurality of radially arranged feeding plates (242) are uniformly fixed between the first arc plate (222) and the second arc plate (223) on the rotating shaft (241). A second toothed disc (243) that meshes with the first toothed disc (144) is fixed at one end of the rotating shaft (241).

9. A material flow directional loading device with a feeding scoop and belt speed synchronized according to claim 8, characterized in that, The linear velocity of the belt (143) at the top of the second guide roller (142) is Va, the linear velocity of the feed plate (242) at the bottom of the second arc plate (223) is Vb, and the transmission ratio of the first toothed disc (144) and the second toothed disc (243) satisfies Va equal to Vb.

10. A material flow directional loading device with a feeding scoop and belt speed synchronized according to claim 5, characterized in that, The dust collection assembly (23) includes a hood (231), which is fixed to the outside of the tail plate (212) and forms an air duct with the tail plate (212) and two side plates (211). The hood (231) has several through holes (232) communicating with the air duct, and a fan (233) is installed in the through holes (232). A partition (234) is fixed inside the hood (231), and a baffle (235) is hinged above the partition (234). When the baffle (235) is not subjected to wind force, it abuts against the second arc plate (223) and closes the air duct. When the baffle (235) is subjected to wind force, it opens the air duct. A collection groove (236) is installed at the bottom of the hood (231) and the partition (234).

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