Material scattering structure for fried food processing

Abstract

The invention relates to the technical field of food processing, in particular to a fried food processing scattering structure which comprises a conical barrel and two supporting discs arranged at the two ends of the conical barrel, the conical barrel rotates on the supporting discs, the axis of the conical barrel is horizontal, a plurality of push plates are arranged on the inner wall of the conical barrel at intervals, and the push plates are arranged on the conical barrel. An arc-shaped shielding plate is arranged between the two supporting discs; by adopting an automatic material scattering mode, the material scattering work can be changed into an automatic production mode from a manual mode, so that the manpower is liberated, the operation mode is simplified, the working efficiency is improved, the working mode of continuous material scattering is realized, and equipment can be conveniently connected into a continuous production line; by means of the mode that the air blows the food raw materials to be suspended and turned over and the mode that the air blows the seasonings to be diffused, the seasonings can be comprehensively and evenly attached to the surfaces of the food raw materials, the seasoning scattering effect is improved, and the mode has low limitation on the shape of the food.

Description

Technical Field

[0001] The invention relates to the technical field of food processing, in particular to a material spreading structure for processing fried food. Background Art

[0002] With the rapid development of the modern food industry, fried foods have occupied an important position in the fields of snacks, fast food and pre-prepared foods due to their unique flavor and convenience. Consumers' demand for food taste, flavor diversity and quality stability is constantly increasing, prompting the production end to put forward higher requirements for the refinement of processing technology. Among them, the sprinkling process is the core step of the later seasoning of fried foods, which directly affects the flavor uniformity, appearance quality and production efficiency of the product.

[0003] Traditional spreading processes mostly rely on manual operations or simple mechanical devices, and have problems such as uneven spreading, low efficiency, and seasoning waste. Especially when processing ingredients with different shapes and surface characteristics (such as flaky potato crisps and multi-curved chicken nuggets), the fixed spreading structure is difficult to adapt to the posture changes during dynamic transportation of ingredients, which can easily lead to local excessive accumulation or leakage. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a fried food processing and spreading structure, the specific technical solution adopted by the present invention is: The present invention provides a fried food processing and spreading structure, comprising a cone and two support plates arranged at both ends of the cone, wherein the cone rotates on the support plates, the axis of the cone is horizontal, a plurality of push plates are arranged at intervals on the inner wall of the cone, an arc-shaped shield is arranged between the two support plates, a bulking ramp is arranged on the top of the arc-shaped shield, and a spray structure used in conjunction with the bulking ramp is arranged on the inner wall of the arc-shaped shield; The distance between the outer wall of the arc-shaped shield and the inner wall of the cone is constant, the push plate is used in conjunction with the arc-shaped shield, and a discharge part and a feed part for discharging and feeding are respectively provided at both ends of the cone.

[0005] Furthermore, the push plate is in a stepped shape along the axis of the cone.

[0006] Furthermore, the arc-shaped shield is rotatable around the axis of the cone.

[0007] Furthermore, the injection structure includes an air pipe installed on the inner wall of the arc-shaped shield plate, a plurality of nozzles are opened on the air pipe, an arc-shaped guide plate corresponding to each nozzle is arranged in the air pipe, and the arc-shaped guide plate semi-shiels the inside of the air pipe.

[0008] Furthermore, each of the nozzles is provided with a bulk hopper, and the bulk hopper is flat along the length direction of the air pipe.

[0009] Furthermore, the arc-shaped shield can be vibrated along the axis direction of the cone.

[0010] Furthermore, a transmission ring is provided on the end face of the cone, a transmission wheel is provided inside the transmission ring, the transmission wheel is installed on one of the support plates, a push-pull arm is eccentrically rotated on the transmission wheel, a sliding rod is provided at one end of the push-pull arm away from the transmission wheel, the sliding rod passes through the air pipe and is connected to the arc-shaped shield.

[0011] Furthermore, the discharge portion includes a plurality of discharge ports opened on the circumferential outer wall of the cone and an outer cover wrapped around the outside of the plurality of discharge ports. The outer cover is rotatably connected to the cone, and an inclined channel for discharge is provided at the bottom of the outer cover.

[0012] Furthermore, the feed part includes a feed pipe obliquely installed on the corresponding support plate, the feed pipe is connected to the cone, an air groove is opened on the feed pipe, a filter screen and a shielding curtain are arranged in the air groove, the filter screen is used to filter the air entering the air groove, the bottom of the shielding curtain hangs down to the bottom of the feed pipe, and an air pipe is arranged in communication with the air groove.

[0013] The beneficial effects of the present invention are: By adopting an automated spreading method, the spreading work can be transformed from manual to automated production mode, thereby freeing up manpower, simplifying the operation method, improving work efficiency, and realizing a continuous bulk material working mode, which facilitates the equipment to be connected to a continuous production line; using a method of blowing food raw materials in the air and a method of blowing condiments to diffuse gas, the condiments can be fully and evenly attached to the surface of the food raw materials, thereby improving the spreading effect, and this method has fewer restrictions on the shape of the food. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 yes Figure 1 Schematic diagram of the middle cone and its upper structure; Figure 3 yes Figure 2 Another perspective structural diagram; Figure 4Schematic diagram of a shape of a cone and its inner push plate in an embodiment of the present invention; Figure 5 2. It is a structural diagram of the support plate and the arc-shaped shield in an embodiment of the present invention; Figure 6 yes Figure 5 Structural diagram from another perspective; Figure 7 yes Figure 6 Schematic diagram of the cross-section and enlarged structure of the middle injection structure; Figure 8 This is a schematic cross-sectional view of the injection structure in an embodiment of the present invention; Figure 9 Schematic diagram of another shape of the push plate in an embodiment of the present invention.

[0016] Reference numerals: 1. Cone; 2. Support plate; 3. Push plate; 4. Arc shield; 5. Bulk material ramp; 6. Injection structure; 7. Discharge section; 8. Feed section; 9. Frame; 10. Adjustment motor; 11. Driving wheel; 12. Air pipe; 13. Arc guide plate; 14. Bulk material hopper; 15. Transmission ring; 16. Transmission wheel; 17. Push-pull arm; 18. Slide rod; 19. Outer cover; 20. Discharge port; 21. Feed pipe; 22. Air trough; 23. Filter; 24. Shielding curtain; 25. Air pipe. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0020] like Figures 1 to 8 As shown, a fried food processing and spreading structure of the present invention comprises a cone 1 and two support plates 2 provided at both ends of the cone 1. The cone 1 rotates on the support plates 2, with the axis of the cone 1 being horizontal. A plurality of push plates 3 are provided at intervals on the inner wall of the cone 1. An arc-shaped shield plate 4 is provided between the two support plates 2. A bulk material ramp 5 is provided on the top of the arc-shaped shield plate 4. A spray structure 6 used in conjunction with the bulk material ramp 5 is provided on the inner wall of the arc-shaped shield plate 4. The distance between the outer wall of the arc shield 4 and the inner wall of the cone 1 is constant, the push plate 3 is used in conjunction with the arc shield 4, and the two ends of the cone 1 are respectively provided with a discharge part 7 and a feed part 8 for discharging and feeding; In the present invention, the cone 1 is arranged horizontally, and the shape characteristics of the cone 1 itself can allow food raw materials to slide naturally from one end of the cone 1 to the other end in the cone 1, thereby realizing the automatic transportation of food, the feeding part 8 is installed at the upper end where the raw materials slide, and the discharging part 7 is installed at the lower end where the raw materials slide, so that as the raw materials are continuously introduced into the cone 1 through the feeding part 8 and discharged through the discharging part 7, a continuous processing working mode of the raw materials can be realized; the two supporting plates 2 are mainly used to seal the cone 1, so that a closed space is formed inside the cone 1, and the supporting plates 2 can support the cone 1 so that the cone 1 can rotate smoothly in the horizontal direction; the supporting plates 2 simultaneously support the arc-shaped shielding plate 4, Since the distance between the outer wall of the arc-shaped shield plate 4 and the inner wall of the cone cylinder 1 is constant, it can be considered that the shape of the arc-shaped shield plate 4 is consistent with the shape of the cone cylinder 1, and the arc-shaped shield plate 4 is coaxial with the cone cylinder 1. This arrangement can make the width of the push plate 3 at different positions on the axis of the cone cylinder 1 consistent, that is, the overall shape of the push plate 3 is an oblique parallelogram, and the push plate 3 can effectively push the raw materials at different positions and different stacking heights in the cone cylinder 1, avoiding the situation where the height of the push plate 3 at different positions is inconsistent when the shape of the arc-shaped shield plate 4 is parallel to the axis of the cone cylinder 1, that is, the height of the push plate 3 at the position close to the feeding part 8 is smaller, and the height of the push plate 3 at the position close to the discharging part 7 is larger, resulting in the smaller height being able to push only a small amount of raw materials to move; It should be noted that the shape of the arc shield 4 can be set so that the push plate 3 moves between the arc shield 4 and the cone 1, so that the push plate 3 and the arc shield 4 are in sliding contact, thereby forming an isolation structure between the push plate 3 and the cone 1, thereby preventing the raw materials from falling through the gap between the push plate 3 and the arc shield 4; the bulk material ramp 5 is mainly used for scattering the raw materials; When in use, the cone cylinder 1 is rotated to drive the cone cylinder 1 to drive several push plates 3 therein to rotate synchronously. Each push plate 3 passes through the gap between the cone cylinder 1 and the arc-shaped shield plate 4 in turn, and the food raw materials are introduced into one end of the cone cylinder 1 through the feeding part 8. With the natural sliding of the raw materials and the rotation of the push plate 3, the raw materials can move laterally in the cone cylinder 1, and the push plate 3 can push the raw materials through the space between the arc-shaped shield plate 4 and the cone cylinder 1 and push the raw materials onto the bulk material ramp 5. At this time, the push plate 3 tilts downward, and the raw materials on the push plate 3 slide onto the bulk material ramp 5 and then naturally scatter with the help of the inclined surface of the bulk material ramp 5. In this process, the injection structure 6 discharges gas mixed with food seasonings, and the gas can be used to blow the scattered raw materials on the bulk material ramp 5 to roll. The seasoning in the gas can adhere to the tumbling food raw materials, thereby realizing automatic spreading, and this suspended tumbling spreading method can make the seasoning adhere more evenly; since the shape of the arc shield 4 is consistent with that of the cone 1 and is also conical, the bulk material ramp 5 on the arc shield 4 is inclined, and its inclination direction is toward the discharge part 7, so that when the raw materials slide on the bulk material ramp 5, they slide toward the discharge part 7, thereby making the raw materials scattered in a specified direction. As the raw materials move horizontally in the cone 1, and the multiple push plates 3 continue to push the raw materials to repeat the scattering movement, the seasoning is evenly and comprehensively adhered to the food raw materials, and the raw materials that have been spread can be discharged through the discharge part 7; By adopting an automated spreading method, the spreading work can be transformed from manual to automated production mode, thereby freeing up manpower, simplifying the operation method, improving work efficiency, and realizing a continuous bulk material working mode, which facilitates the equipment to be connected to a continuous production line; using a method of blowing food raw materials in the air and a method of blowing condiments to diffuse gas, the condiments can be fully and evenly attached to the surface of the food raw materials, thereby improving the spreading effect, and this method has fewer restrictions on the shape of the food.

[0021] Furthermore, the shape of the push plate 3 is stepped along the axial direction of the cone cylinder 1. Since the push plate 3 mainly plays the role of pushing and lifting the raw materials in the cone cylinder 1, it is necessary to reduce the distance of the raw materials along the axial direction of the cone cylinder 1 during the stage of pushing the raw materials to move. This allows the raw materials to be scattered and spread more times in the cone cylinder 1, thereby increasing the number of spreading times. To achieve this purpose, the shape of the push plate 3 can be set to be stepped, so that when the push plate 3 contacts the raw materials, the stepped position on the push plate 3 is used to block the lateral movement of the raw materials in the cone cylinder 1. It should be noted that the shape of the push plate 3 can be as follows: Figure 4As shown in the shape, the two surfaces of each step in the shape are perpendicular to each other, so that the head and tail ends of the push plate 3 are at a certain distance along the circumferential direction of the cone 1. In this way, when the push plate 3 pushes the raw materials onto the bulk material ramp 5, the raw materials on the push plate 3 gradually move from one end of the push plate 3 to the other end to the height position of the bulk material ramp 5, that is, the scattering of the raw materials on the push plate 3 is linear scattering rather than simultaneous scattering. Of course, the shape of the push plate 3 can also be as follows Figure 9 The shape shown in the figure has an acute angle between the two faces of each step, and the line connecting the head and tail ends of the push plate 3 is coplanar with the axis of the cone 1. In this way, when the push plate 3 pushes the raw materials to the position of the bulk material ramp 5, each step of the push plate 3 will release the raw materials at the same time. Therefore, the above two methods can both realize bulk material work, but the specific operation methods and the effects achieved are different.

[0022] Furthermore, the arc-shaped shield plate 4 is rotatably arranged around the axis of the cone 1. In order to adjust the speed, time and scattering mode of different raw materials sliding on the bulk material ramp 5, the inclination angle of the bulk material ramp 5 can be adjusted. That is, the rotatable arrangement of the arc-shaped shield plate 4 allows the bulk material ramp 5 to be rotated around the axis of the cone 1 by a specified angle, thereby achieving adjustment of the arc-shaped shield plate 4 and the bulk material ramp 5. During specific operation, the inclination angles of the arc shield 4 and the bulk material ramp 5 can be adjusted by adjusting the two support plates 2. Since the arc shield 4 rotates around the cone 1, the distance between the arc shield 4 and the cone 1 remains constant. In actual use, a frame 9 can be set for the cone 1 and the support plate 2, so that both support plates 2 are rotatably mounted on the frame 9, and an adjustment motor 10 for providing power to the support plates 2 and a driving wheel 11 for providing rotational power to the cone 1 are set on the frame 9.

[0023] Furthermore, the spray structure 6 includes an air pipe 12 mounted on the inner wall of the arc-shaped shield 4, with a plurality of nozzles opened on the air pipe 12, and an arc-shaped guide plate 13 corresponding to each nozzle is provided in the air pipe 12, and the arc-shaped guide plate 13 semi-shields the interior of the air pipe 12; In the present invention, the air pipe 12 is fixed to the inner wall of the arc-shaped shield plate 4, and the nozzles on the air pipe 12 are oriented toward the bottom end surface of the bulk material ramp 5, so that the raw materials scattered on the bulk material ramp 5 can be blown by the airflow ejected from the plurality of nozzles; Since the air in the trachea 12 moves synchronously with the granular condiments, when the air is introduced into the trachea 12, the air will move along the length direction of the trachea 12, and part of the air will be discharged through different nozzles. However, due to the inertia of the condiments, it is not easy for them to follow the air to turn and be ejected through the nozzles. They will gather in large quantities at the tail end of the trachea 12. To improve this phenomenon, a number of arc-shaped guide plates 13 corresponding to each nozzle can be arranged at intervals on the lower side of the inside of the trachea 12, and the arc-shaped guide plates 13 can only half-block the inside of the trachea 12. In this way, the guiding effect of the arc-shaped guide plates 13 can be utilized to allow part of the airflow and condiments to be discharged smoothly through the nozzles, while other airflow and condiments can pass over the arc-shaped guide plates 13 and move to different nozzle positions. In this way, the condiments can be guided, and the condiments can be transported in the trachea 12 along the length direction of the trachea 12, and it is convenient for the condiments to be ejected at different nozzle positions.

[0024] Furthermore, each nozzle is provided with a bulk hopper 14, and the bulk hopper 14 is flat along the length direction of the air pipe 12; When the airflow in the air pipe 12 is ejected through the bulk hopper 14, the airflow will diffuse along the axis of the cone 1, thereby increasing the seasoning diffusion area in the transverse direction of the scattered food raw materials, improving the spreading effect and avoiding seasoning aggregation.

[0025] Furthermore, the arc shield 4 can be vibrated along the axis of the cone 1; When the raw materials slide down the bulk material ramp 5, in order to increase the diffusion area of the raw materials in the width direction of the bulk material ramp 5, the bulk material ramp 5 can be made to perform a transverse reciprocating motion, that is, the arc-shaped shielding plate 4 reciprocates along the axis direction of the cone 1, thereby preventing the raw materials from piling up on the bulk material ramp 5, improving the dispersion of the raw materials, and preventing the raw materials from blocking each other; In order to improve the dispersion of raw materials, the working surface of the bulk material ramp 5 can be set to a rough surface, or a plurality of rows of protrusions can be set on the working surface of the bulk material ramp 5, such as Figure 6 As shown, several rows of protrusions are arranged horizontally.

[0026] Furthermore, a transmission ring 15 is provided on the end surface of the cone 1, and a transmission wheel 16 is provided inside the transmission ring 15. The transmission wheel 16 is mounted on a support plate 2. A push-pull arm 17 is eccentrically rotated on the transmission wheel 16. A slide rod 18 is provided on the end of the push-pull arm 17 away from the transmission wheel 16. The slide rod 18 passes through the air pipe 12 and is connected to the arc-shaped shield 4. In the traditional method, since the arc shield 4 needs to vibrate, a vibration mechanism can be directly installed on the support plate 2. However, this method will make the structure of the entire device more complicated and the control method more cumbersome due to the addition of a new power source. In order to achieve simple control or even no need to control the vibration of the arc shield 4, the above structure can be adopted, such as Figures 4 and 5As shown, when the cone 1 rotates, it drives the transmission ring 15 to rotate synchronously. The transmission ring 15 uses the transmission wheel 16 and the push-pull arm 17 to drive the transmission ring 15 to reciprocate along the axis of the cone 1. The slide rod 18 then drives the arc-shaped shield 4 to reciprocate. In this way, the vibration power of the arc-shaped shield 4 can be provided by the rotation of the cone 1, and there is no need to separately control the vibration of the arc-shaped shield 4. It should be pointed out that in order to ensure that no gap is generated between the arc-shaped baffle 4 and the support plates 2 when it moves, a groove with the same shape as the arc-shaped baffle 4 and the bulk material ramp 5 can be opened on the end face of the support plate 2. The lateral ends of the arc-shaped baffle 4 and the lateral ends of the bulk material ramp 5 can be slid into the groove, so that when the arc-shaped baffle 4 and the bulk material ramp 5 vibrate, their ends will not be exposed in the cone 1; the sliding rod 18 slides along the axial direction of the cone 1 through the support plate 2 and is connected to the arc-shaped baffle 4.

[0027] Furthermore, the discharge portion 7 includes a plurality of discharge openings 20 provided on the outer circumferential wall of the cone 1 and an outer cover 19 wrapped around the outer sides of the plurality of discharge openings 20. The outer cover 19 is rotatably connected to the cone 1, and an inclined channel for discharge is provided at the bottom of the outer cover 19. In the present invention, since the cone 1 is in a rotating state, the discharge portion 7 needs to be specially configured. As shown above, the position of the outer cover 19 is fixed. When the cone 1 rotates, several discharge ports 20 thereon will always be located on the inner side of the outer cover 19. The food raw materials that have been spread in the cone 1 will fall into the outer cover 19 through different discharge ports 20. The raw materials in the outer cover 19 can be discharged through the inclined channel at the bottom thereof, thereby realizing the discharge of the raw materials.

[0028] Furthermore, the feed portion 8 includes a feed pipe 21 obliquely mounted on the corresponding support plate 2. The feed pipe 21 is connected to the cone 1. An air groove 22 is provided on the feed pipe 21. A filter 23 and a shielding curtain 24 are provided in the air groove 22. The filter 23 is used to filter the air entering the air groove 22. The bottom of the shielding curtain 24 hangs down to the bottom of the feed pipe 21. An air pipe 25 is provided in communication with the air groove 22. The air in the air tank 22 is then drawn out of the air filter 23 and the air in the air filter 23 is drawn in. The air in the air tank 22 is then drawn out of the air filter 23 and the air in the air filter 23 is drawn in. The air in the air tank 22 is then drawn out or sucked out through the air pipe 25. When the air pipe 25 is exhausted normally, part of the air in the cone 1 is discharged through the discharge portion 7. At this time, part of the condiments are discharged through the discharge portion 7 and a small amount of waste is caused. When the air pipe 25 is in an inhalation mode, the external air can be reversely replenished into the cone 1 through the discharge portion 7, thereby eliminating the waste of condiments. When feeding, the food raw materials can be normally introduced into the cone 1 through the feeding pipe 21. At this time, the food raw materials in the feeding pipe 21 will normally push open the shielding curtain 24.

[0029] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fried food processing and spreading structure, characterized in that: It includes a cone and two support plates arranged at both ends of the cone, the cone rotates on the support plates, the axis of the cone is horizontal, a plurality of push plates are arranged at intervals on the inner wall of the cone, an arc-shaped shield is arranged between the two support plates, a bulk material ramp is arranged on the top of the arc-shaped shield, and a spraying structure used in conjunction with the bulk material ramp is arranged on the inner wall of the arc-shaped shield; The distance between the outer wall of the arc-shaped shield and the inner wall of the cone is constant, the push plate is used in conjunction with the arc-shaped shield, and a discharge part and a feed part for discharging and feeding are respectively provided at both ends of the cone.

2. A fried food processing and spreading structure according to claim 1, characterized in that: The push plate is in a stepped shape along the axis of the cone.

3. A fried food processing and spreading structure according to claim 2, characterized in that: The arc-shaped shield is rotatable around the axis of the cone.

4. A fried food processing and spreading structure according to claim 3, characterized in that: The injection structure includes an air pipe installed on the inner wall of the arc-shaped shield plate, and a plurality of nozzles are opened on the air pipe. An arc-shaped guide plate corresponding to each nozzle is arranged in the air pipe, and the arc-shaped guide plate semi-shiels the inside of the air pipe.

5. The fried food processing and spreading structure according to claim 4, characterized in that: Each of the nozzles is provided with a bulk hopper, and the bulk hopper is flat along the length direction of the air pipe.

6. The fried food processing and spreading structure according to claim 5, characterized in that: The arc-shaped shield can be vibrated along the axis direction of the cone.

7. The fried food processing and spreading structure according to claim 6, characterized in that: A transmission ring is provided on the end surface of the cone, a transmission wheel is provided inside the transmission ring, the transmission wheel is mounted on one of the support plates, a push-pull arm is eccentrically rotated on the transmission wheel, a sliding rod is provided on the end of the push-pull arm away from the transmission wheel, the sliding rod passes through the air pipe and is connected to the arc-shaped shield.

8. The fried food processing and spreading structure according to claim 7, characterized in that: The discharge portion includes a plurality of discharge ports opened on the outer circumferential wall of the cone and an outer cover wrapped around the outer sides of the plurality of discharge ports. The outer cover is rotatably connected to the cone, and an inclined channel for discharge is provided at the bottom of the outer cover.

9. The fried food processing and spreading structure according to claim 8, characterized in that: The feed part includes a feed pipe obliquely installed on the corresponding support plate, the feed pipe is connected to the cone, an air groove is provided on the feed pipe, a filter screen and a shielding curtain are provided in the air groove, the filter screen is used to filter the air entering the air groove, the bottom of the shielding curtain hangs down to the bottom of the feed pipe, and an air pipe is provided in communication with the air groove.

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