Vacuum spraying device and preparation process of puffer big yellow croaker compound feed

Abstract

The application discloses a vacuum spraying device and a preparation process of puffed compound feed for large yellow croaker, and relates to the technical field of feed preparation. The device comprises a box body, a leakage-proof discharge valve arranged below the box body, a feed inlet nozzle arranged on the box body, an auger rotatably arranged in the box body, a driving element arranged on the box body and used for driving the rotation of the auger, a first isolation pipe arranged in the box body, the auger being arranged in the first isolation pipe, a first material guide plate being circumferentially arranged on the outer side wall of the first isolation pipe, the first material guide plate being arranged in an inclined downward manner, a second material guide plate being circumferentially arranged on the inner side wall of the box body, the second material guide plate being arranged in an inclined downward manner, and feed particles being sequentially sent into a storage cavity through the first material guide plate and the second material guide plate after being sent out from the upper end of the first isolation pipe by the auger. The application has the effect of improving the spraying rate of the feed particles for large yellow croaker.

Description

Technical Field

[0001] This application relates to the technical field of feed preparation, and in particular to a vacuum spraying device and a process for preparing extruded compound feed for large yellow croaker. Background Technology

[0002] Large yellow croaker is a unique local marine fish species in my country. It has high nutritional value and delicious taste, making it a popular edible fish and one of the main fish species farmed in my country.

[0003] Vacuum spraying equipment is a device used to process feed for large yellow croaker. Vacuum spraying feed can add oils and other nutritional additives into expanded pellet feed, and can make the added oils and other liquids penetrate into the inside of the pellets, improving the energy level and nutritional value of the feed, while preventing the liquid from falling off the pellet surface and oxidizing.

[0004] Reference Figure 1 and Figure 2 The vacuum spraying equipment includes a box 1 for holding feed pellets. The box 1 is a sealed space. A leak-proof feed valve 11 is welded on the top of the box 1, and a leak-proof discharge valve 12 is welded on the bottom of the box 1. Both the leak-proof feed valve 11 and the leak-proof discharge valve 12 have a circular plate on the side facing the box 1. By opening the circular plate, feed pellets can pass through. A baffle 17 can form a sealed space with the box 1. A paddle for stirring the feed pellets is rotatably installed inside the box 1. The box 1 is also equipped with a feed nozzle 13, a vacuum extraction pipe, and an air compensation pipe. The end of the vacuum extraction pipe away from the box 1 is connected to a vacuum pump, so that a vacuum can be drawn inside the box 1 through the vacuum extraction pipe. The air compensation pipe is used to inject air into the box 1. The feed nozzle 13 can atomize the liquid and spray it into the box 1.

[0005] When coating the feed pellets inside the container, the container is first evacuated to a vacuum state through a vacuum extraction pipe. Then, the front drive blades rotate while simultaneously spraying oil mist into the container through the feed nozzles. The feed pellets mix with the oil mist in the air under the continuous stirring of the blades, causing liquid to adhere to the surface of the feed pellets. Then, air is injected into the container through an air compensation pipe. Under the pressure difference, the liquid adhering to the surface of the feed pellets can penetrate into the interior of the feed pellets, thus completing the coating process.

[0006] Regarding the aforementioned technologies, the method of mixing feed pellets with oil mist in the air by agitating them with paddles has limitations. Because a large number of feed pellets are piled up together, only the feed pellets on the surface can be sprayed with oil mist. Even with agitation by paddles, the effect is not ideal, and the spraying rate of the feed pellets is low, indicating room for improvement. Summary of the Invention

[0007] To improve the coating rate of feed pellets for large yellow croaker, this application provides a vacuum spraying device, employing the following technical solution:

[0008] A vacuum spraying device includes a housing, a leak-proof discharge valve is provided at the bottom of the housing, a feed nozzle is provided on the housing, the internal space of the housing includes a spraying chamber and a storage chamber, the spraying chamber and the storage chamber are connected and the spraying chamber is located above the storage chamber, the storage chamber is flared and the flare of the storage chamber faces the spraying chamber;

[0009] It also includes an auger rotatably disposed within the housing, a drive unit disposed on the housing for driving the auger to rotate, and a first isolation tube disposed within the housing. The auger is disposed within the first isolation tube, and there are gaps between the first isolation tube and the upper and lower ends of the housing for feed particles to pass through. The auger includes a central shaft and spiral blades coiled around the central shaft. The drive unit can drive the central shaft to rotate. The outer sidewall of the spiral blades abuts against the inner sidewall of the first isolation tube. The auger extends into the storage cavity.

[0010] A first guide plate is circumferentially arranged on the outer sidewall of the first isolation tube, and the first guide plate is inclined downward. A second guide plate is circumferentially arranged on the inner sidewall of the box, and the second guide plate is inclined downward. After the feed pellets are sent out from the upper end of the first isolation tube by the auger, they fall into the storage cavity after passing through the first guide plate and the second guide plate in sequence.

[0011] By adopting the above technical solution and combining the background technology, feed pellets are fed into the box, and the feed falls into the storage cavity of the box. The auger is driven to rotate by the drive component. The auger can carry the feed pellets accumulated in the storage cavity upward along the spiral blades of the auger. When the feed pellets are sent to a height above the first isolation tube by the auger, the feed pellets pass over the upper surface of the first isolation plate and fall onto the first guide plate under the interaction of the centrifugal force of the rotating auger and the continuously upward conveyed feed pellets.

[0012] At the same time, the feed nozzle inside the box continuously sprays out oil mist, which can fall onto the first guide plate and the second feed plate. When the feed particles pass through the first guide plate and the second guide plate, the oil mist inside the box can fall onto the surface of the feed particles, and at the same time, the oil mist on the first guide plate and the second guide plate can also rise onto the surface of the feed particles.

[0013] Moreover, by continuously conveying feed pellets through the auger, the amount of feed pellets delivered to the first guide plate each time is not too large, allowing more feed pellets to be coated with oil mist. As the feed pellets roll from the first guide plate to the second guide plate, they tumble continuously, resulting in more even coating of oil mist around the feed pellets, thereby improving the spraying rate of the feed for large yellow croaker.

[0014] Optionally, the nozzle of the feed nozzle faces the direction of the first guide plate. Both the first and second guide plates are provided with multiple feed nozzles along the length of the first isolation tube, and multiple feed nozzles are provided corresponding to the first guide plate.

[0015] By adopting the above technical solution, setting up multiple first and second guide plates, and simultaneously setting up multiple feed nozzles to spray the feed onto the first guide plates, the spraying rate of the large yellow croaker feed can be increased.

[0016] Optionally, a second isolation tube is rotatably connected to the outside of the first isolation tube, the first guide plate is disposed on the outer sidewall of the second isolation tube, and a transmission component that drives the second isolation tube to rotate is disposed on the central shaft.

[0017] By adopting the above technical solution, the transmission component drives the second isolation tube to rotate, which in turn drives the first guide plate to rotate, thereby causing the feed particles falling on the first guide plate to rotate along the first guide plate. Since feed particles located near the feed nozzle receive better spraying effects when they fall onto the first guide plate, while those far from the feed nozzle receive poorer spraying effects, the rotation of the first guide plate causes the feed particles to slide down in a rotating trajectory. This ensures that feed particles far from the feed nozzle on the first guide plate will be closer to the feed nozzle after sliding down to the next first guide plate, thus reducing the possibility of feed particles not being properly coated with oil mist.

[0018] Optionally, a baffle is provided on the inner side wall of the box, and a connecting plate is provided at the end of the first guide plate away from the second isolation tube. The baffle is provided with a slot for the connecting plate. Multiple baffles are provided around the same first guide plate. There is a gap between adjacent baffles for feed particles to pass through. The feed nozzle is provided at the gap between two adjacent baffles.

[0019] By adopting the above technical solution, the connecting plate is inserted into the baffle, so that the baffle can restrict the feed particles on the first guide plate from sliding down, so that the feed particles can only fall from the gap between two adjacent baffles. At the same time, the feed nozzle is set at the gap between two adjacent baffles, so that the feed particles that fall can better adhere to the oil mist.

[0020] Optionally, the baffle is provided with a stirring component, which is inclined and the inclination direction of the stirring component is parallel to the inclination direction of the first guide plate.

[0021] By adopting the above technical solution, the baffle is equipped with a stirring component. When the first guide plate rotates and drives the feed particles to pass through the stirring component, the stirring component stirs the feed particles. On the one hand, it can make the feed particles turn over, and on the other hand, it can make the feed particles rub against each other continuously. Through the friction between the feed particles, the oil mist adhering to the surface of the feed particles becomes more uniform.

[0022] Optionally, the stirring component includes a stirring ring and a stirring rod, the stirring rod being rotatably mounted on the baffle, and multiple stirring components are spaced apart along the extending direction of the baffle.

[0023] By adopting the above technical solution, the specific structure of the mixing component is disclosed. At the same time, the rotating connection between the mixing ring and the baffle allows the mixing ring to rotate, thereby improving the mixing effect on feed pellets.

[0024] Optionally, a transmission rod is provided on the second isolation tube, and a transmission ring is provided at one end of the connecting rod opposite to the second isolation tube. The transmission ring is rotatably connected to the housing. The transmission component includes a first gear coaxially disposed on the outer sidewall of the central shaft and a second gear rotatably disposed on the housing. Teeth are provided on the inner sidewall of the transmission ring. The first gear meshes with the second gear, and the second gear meshes with the teeth.

[0025] By adopting the above technical solution, the rotation of the central shaft drives the first gear to rotate, which in turn drives the second gear to rotate in the opposite direction. The second gear drives the transmission ring to rotate in the same direction as the second gear, which means that the rotation direction of the second isolation tube is opposite to that of the auger. While realizing the rotation of the second isolation tube, it can also disperse the feed particles sent out from the auger, thereby improving the spraying rate. In addition, the second isolation tube is rotatably connected to the box body through the transmission rod and the transmission ring. This not only allows the second isolation tube to be rotatably connected to the box body, but also provides space for feed particles to pass through between the second isolation tube and the inner side wall of the box body.

[0026] Optionally, a limiting ring is provided on the side wall of the first isolation tube facing the second isolation tube, and a limiting groove is provided on the side wall of the second isolation tube facing the first isolation tube for the limiting ring to slide.

[0027] By adopting the above technical solution, the limiting ring slides within the limiting groove, thereby enabling the second isolation tube to be rotatably connected to the first isolation tube, and also increasing the stability of the second isolation tube.

[0028] Secondly, this application provides a process for preparing extruded compound feed for large yellow croaker, using the following technical solution:

[0029] A process for preparing extruded compound feed for large yellow croaker includes the following steps:

[0030] S1: Mixing, which involves mixing and stirring various feed ingredients;

[0031] S2: Granulation, which involves crushing the raw materials into powder, extruding the powder into strips, and then cutting them into granules;

[0032] S3: Extrusion, which involves extruding granular feed at 120℃~150℃;

[0033] S4: Spraying. Using the vacuum spraying device described above, the expanded feed pellets are put into the box of the vacuum spraying device. The box is first evacuated, and then the feed pellets in the storage chamber are conveyed upward by the auger onto the first guide plate. At the same time, oil mist is sprayed out through the feed nozzle. The feed pellets pass through the first guide plate and the second guide plate in sequence, and oil mist adheres to the surface of the feed pellets during the downward movement. Then, air is introduced into the box, so that the oil mist on the surface of the feed pellets can be penetrated into the interior of the feed pellets under the action of pressure difference.

[0034] S5: Drying, drying the feed pellets at 60℃~80℃;

[0035] S6: Packaging, bagging the dried granules.

[0036] In summary, this application includes at least one of the following beneficial effects:

[0037] 1. The feed pellets are conveyed upward by the auger and rolled sequentially over the first and second guide plates before falling into the storage chamber. This reduces the accumulation of feed pellets during spraying, resulting in a longer and more uniform spraying time for the feed pellets.

[0038] 2. By rotating the first guide plate and setting up a stirring component to stir the feed pellets, the feed pellets can be further dispersed, thereby resulting in a higher feed pellet spraying rate. Attached Figure Description

[0039] Figure 1 This is a structural diagram of the related technology;

[0040] Figure 2 This is a cross-sectional structural diagram of the enclosure related to the technology;

[0041] Figure 3 This is a schematic diagram of the structure of Example 1;

[0042] Figure 4This is a cross-sectional structural diagram of the box;

[0043] Figure 5 This is a cross-sectional view of the first isolation tube;

[0044] Figure 6 This is a structural schematic diagram of the transmission component;

[0045] Figure 7 yes Figure 5 A magnified structural diagram of point A in the middle.

[0046] Explanation of reference numerals in the attached drawings: 1. Box body; 11. Leak-proof feed valve; 12. Leak-proof discharge valve; 13. Feed nozzle; 14. Spraying chamber; 15. Storage chamber; 16. Second guide plate; 17. Baffle; 171. Slot; 2. Screw; 21. Central shaft; 22. Spiral blade; 3. Drive component; 4. First isolation tube; 41. First guide plate; 411. Connecting plate; 42. Limiting ring; 5. Transmission component; 51. First gear; 52. Second gear; 6. Agitator; 61. Agitator ring; 62. Agitator rod; 7. Second isolation tube; 71. Transmission rod; 72. Transmission ring; 721. Tooth; 73. Limiting groove. Detailed Implementation

[0047] The following is in conjunction with the appendix Figure 2-7 This application will be described in further detail.

[0048] Example 1:

[0049] This application discloses a vacuum spraying apparatus, referring to... Figure 3 and Figure 4 The vacuum spraying device includes a housing 1. The upper part of the housing 1 is cylindrical, and the lower part is an inverted frustum. Correspondingly, the upper space inside the housing 1 is a spraying chamber 14 for spraying feed pellets, and the lower space inside the housing 1 is a storage chamber 15 for containing feed pellets. The storage chamber 15 and the spraying chamber 14 are interconnected. A leak-proof feed valve 11 is welded to the upper surface of the housing 1, and a leak-proof discharge valve 12 is welded to the lower surface of the housing 1. Feed pellets are fed into the housing 1 through the leak-proof feed valve 11 and discharged from the housing 1 through the leak-proof discharge valve 12. A vacuum extraction pipe for extracting air from the housing 1 and an air compensation pipe for injecting air into the housing 1 are also welded to the upper surface of the housing 1.

[0050] Reference Figure 4 and Figure 5The vacuum spraying device also includes an auger 2 rotatably mounted inside the housing 1, a drive unit 3 for driving the auger 2 to rotate, and a first isolation tube mounted inside the housing 1. Specifically, the auger 2 includes a central shaft 21 and spiral blades 22 coiled and welded around the central shaft 21. The central shaft 21 is arranged vertically, with its upper end extending upward through the housing 1. The side wall of the central shaft 21 is rotatably connected to the housing 1 via a sealed bearing or similar means. The lower end of the auger 2 extends downward into the material storage chamber 15.

[0051] The first isolation tube 4 has a circular cross-section. The auger 2 is located inside the first isolation tube 4, and the side wall of the spiral blade 22 of the auger 2 abuts against the inner side wall of the first isolation tube 4. There is a certain distance between the upper surface of the first isolation tube 4 and the inner side wall of the box 1, so that feed particles can pass through the gap between the first isolation tube 4 and the side wall of the box 1. A connecting rod is welded to the lower end of the first isolation tube 4, and the lower end of the connecting rod is welded to the inner side of the box 1, so that the first isolation tube 4 can be fixed. At the same time, feed particles can also pass through the gap between the lower surface of the first isolation tube 4 and the inner side wall of the box 1.

[0052] Reference Figure 3 and Figure 4 A first guide plate 41 is circumferentially arranged on the outer sidewall of the first isolation tube 4. The first guide plate 41 is inclined downward. There is a certain distance between the end of the first guide plate 41 and the inner sidewall of the box 1. A second guide plate 16 is circumferentially welded on the inner sidewall of the box 1. The second guide plate 16 is also inclined downward. There is also a certain distance between the second guide plate 16 and the outer sidewall of the first isolation tube 4. Thus, the first guide plate 41 and the second guide plate 16 are staggered. The first guide plate 41 and the second guide plate 16 are both arranged in the spraying cavity 14. After the feed pellets are sent out of the first isolation tube 4 from the auger 2, they fall on the first guide plate 41 and can roll down along the first guide plate 41 onto the second guide plate 16, and finally roll into the storage cavity 15. Meanwhile, the auger 2 can convey the feed pellets located at the lower position inside the storage chamber 15 upwards. When the coated feed pellets fall, they land on the surface, so that all the feed pellets in the storage chamber 15 can be conveyed to the first guide plate 41 for coating.

[0053] The housing 1 is also equipped with multiple feeding nozzles 13. The feeding nozzles 13 can atomize the required oils and other nutrient solutions into oil mist. The oil mist can fall onto the surfaces of the first guide plate 41 and the second guide plate 16. When the feed pellets roll from the first guide plate 41, the oil mist can fall onto the surface of the feed pellets. At the same time, the oil mist on the surface of the first guide plate 41 can also adhere to the surface of the feed pellets. The drive unit 3 drives the auger 2 to rotate, continuously conveying the feed pellets upwards and spraying them onto the surfaces of the first guide plate 41 and the second guide plate 16. The number of feed pellets sprayed each time is small, and the feed pellets are not easy to accumulate, thus making the spraying effect of the feed pellets better. Moreover, the feed keeps rolling during the spraying process, which makes the spraying of the feed pellet surface more uniform.

[0054] Reference Figure 3 and Figure 4 Furthermore, multiple first guide plates 41 and second guide plates 16 can be staggered along the vertical direction. In this embodiment, two first guide plates 41 and two second guide plates 16 are provided respectively. The spray nozzle of the feed nozzle 13 faces the direction of the first guide plate 41. Two feed nozzles 13 can be provided on each first guide plate 41, thereby making the spraying effect on feed pellets better.

[0055] Reference Figure 3 and Figure 4 Optionally, a second isolation tube 7 is rotatably connected to the outside of the first isolation tube 4. The cross-section of the second isolation tube 7 is also annular. The inner sidewall of the second isolation tube 7 abuts against the outer sidewall of the first isolation tube 4. The first guide plate 41 is welded to the outer sidewall of the second isolation tube 7. A transmission rod 71 is welded to the upper surface of the second isolation tube 7. The transmission rod 71 can be a circular rod. A transmission ring 72 is welded to the upper surface of the transmission rod 71. The upper end of the transmission ring 72 is rotatably connected to the housing 1. The outer sidewall of the transmission ring 72 can be rotatably connected to the housing 1 through a bearing, thereby fixing the second isolation tube 7 and allowing the second isolation tube 7 to rotate relative to the first isolation tube 4. A transmission component 5 is provided on the central shaft 21 to drive the second isolation tube 7 to rotate.

[0056] Reference Figure 4 and Figure 5 Furthermore, a limiting ring 42 is welded to the outer sidewall of the first isolation tube 4. Multiple limiting rings 42 can be arranged along the length of the first isolation tube 4. The cross-section of the limiting ring 42 is dovetail-shaped. In other embodiments, the cross-section of the limiting ring 42 can also be rectangular or "T"-shaped, etc. A limiting groove 73 for sliding of the limiting ring 42 is opened on the inner sidewall of the second isolation tube 7. The limiting groove 73 is circumferentially opened. The second isolation tube 7 is driven to rotate by the transmission component 5, which drives the first guide plate 41 to rotate, so that when the feed particles fall on the first guide plate 41, they can be further dispersed on the first guide plate 41 under the action of centrifugal force.

[0057] Reference Figure 5 and Figure 6 The driving component 3 can be a motor or a rotary cylinder, etc. In this embodiment, the driving component 3 is a motor, and the output end of the motor is connected to the upper end of the central shaft 21 of the auger 2. The transmission component 5 includes a first gear 51 coaxially welded to the outer sidewall of the central shaft 21, and a second gear 52 rotatably connected to the inner sidewall of the housing 1. The inner sidewall of the transmission ring 72 is provided with teeth 721. The first gear 51 and the second gear 52 mesh with each other, and the outer sidewall of the second gear 52 meshes with the teeth 721 on the inner side of the transmission ring 72.

[0058] The motor is started, driving the central shaft 21 to rotate, which in turn drives the spiral blades 22 to rotate, thereby conveying the feed particles in the storage chamber 15 upwards; at the same time, the first gear 51 rotates, driving the transmission ring 72 to rotate in the opposite direction, so that the second isolation tube 7 and the first guide plate 41 can rotate in the opposite direction to the screw conveyor 2, which helps to further disperse the feed particles.

[0059] Reference Figure 4 and Figure 5 A baffle 17 is provided on the inner side wall of the box body 1. The baffle 17 is an arc-shaped plate, and the inner arc of the baffle 17 corresponds to the arc of the first guide plate 41. The baffle 17 is also arranged vertically. Multiple connecting rods are welded between the baffle 17 and the inner side wall of the box body 1, so that the baffle 17 can be fixed to the box body 1. A connecting plate 411 is integrally formed on the end of the first guide plate 41 away from the second isolation pipe 7. The connecting plate 411 is arranged horizontally. A slot 171 for the connecting plate 411 to be inserted is opened on the inner side wall of the baffle 17. Multiple baffles 17 are arranged around the same first guide plate 41. A gap is left between two adjacent baffles 17 for feed particles to pass through. The feed nozzle 13 is arranged at the gap between two adjacent baffles 17, so that the feed particles can only fall from the gap between the two baffles 17, so that when the feed particles fall onto the first guide plate 41, they can be sprayed with oil mist as much as possible.

[0060] In this embodiment, two baffles 17 are provided around the same first guide plate 41, and two feed sprays are provided for each first guide plate 41, with the two feed sprays corresponding to the gaps between the two baffles 17 respectively.

[0061] Reference Figure 5 and Figure 7 The baffle 17 is provided with a stirring element 6, which is inclined along a direction parallel to the surface of the first guide plate 41, so that when the first guide plate 41 rotates, the feed particles on the first guide plate 41 can be stirred by the stirring element 6.

[0062] Specifically, the mixing component 6 includes a mixing ring 61 and a mixing rod 62. The mixing rod 62 is a round rod, and the mixing ring 61 is rotatably connected to the inner side wall of the baffle 17. The mixing ring 61 has a rectangular cross-section. When the feed particles pass through the mixing ring 61, it can drive the mixing ring 61 to move, so that the mixing ring 61 can play a role in stirring and dispersing the feed particles, making the oil mist on the surface of the feed particles more uniform.

[0063] The implementation principle of the vacuum spraying device in this application embodiment is as follows: the feed particles to be sprayed are put into the box 1 through the anti-leakage feed valve 11, and the feed particles fall into the storage chamber 15. Then, the feed nozzle 13 and the drive component 3 are started to drive the auger 2 to rotate, continuously conveying the feed particles upward. After passing the first isolation pipe 4 and the second isolation pipe 7, the feed particles fall onto the first guide plate 41. As the first guide plate 41 rotates, it passes through the stirring component 6. Under the action of the stirring component 6, the feed particles on the first guide plate 41 are stirred together. Then, the feed particles fall from the gap between the two baffles 17, slide through all the first guide plates 41 and the second guide plates 16 in sequence, and fall into the storage chamber 15, thereby enabling the feed particles to be fully sprayed.

[0064] Example 2:

[0065] This application discloses a process for preparing extruded compound feed for large yellow croaker. This preparation process uses the vacuum spraying device of Example 1 and includes the following steps:

[0066] S1: Mixing, which involves mixing various feed ingredients such as corn, soybean meal, fish meal, fish oil, and starch using a mixer;

[0067] S2: Pelletizing, the mixed raw materials are crushed into powder, the powder is extruded into strips and then cut into pellets to obtain pellet feed.

[0068] S3: Extrusion, which involves extruding granular feed at 120℃~150℃;

[0069] S4: Spraying. Using the vacuum spraying device in Example 1, the expanded feed pellets are put into the housing 1 of the vacuum spraying device. The housing 1 is first evacuated. Then, the feed pellets in the storage chamber 15 are conveyed upward by the auger 2 onto the first guide plate 41. At the same time, oil mist is sprayed out through the feed nozzle 13. The feed pellets pass through the first guide plate 41 and the second guide plate 16 in sequence. During the downward movement, oil mist adheres to the surface of the feed pellets. Then, air is introduced into the housing 1. Under the action of pressure difference, the oil mist on the surface of the feed pellets can be penetrated into the interior of the feed pellets.

[0070] S5: Drying, drying the feed pellets at 60℃~80℃;

[0071] S6: Packaging, bagging the dried granules.

[0072] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vacuum spraying device comprising a box (1) provided with a leakage-proof discharge valve (12) below and a feed-in spraying head (13) above, characterized in that: The inner space of the box (1) comprises a spraying cavity (14) and a material storage cavity (15), the spraying cavity (14) and the material storage cavity (15) are through, and the spraying cavity (14) is above the material storage cavity (15), the material storage cavity (15) is flared, and the flared part of the material storage cavity (15) faces the spraying cavity (14); Further comprising an auger (2) rotatably arranged in the box (1), a driving member (3) arranged on the box (1) for driving the auger (2) to rotate, and a first isolation pipe (4) arranged in the box (1), the auger (2) is arranged in the first isolation pipe (4), the first isolation pipe (4) has a gap for the feed particles to pass between the upper end and the lower end of the box (1), the auger (2) comprises a central shaft (21) and a spiral blade (22) wound on the lateral side of the central shaft (21), the driving member (3) can drive the central shaft (21) to rotate, the outer lateral wall of the spiral blade (22) abuts against the inner lateral wall of the first isolation pipe (4), and the auger (2) extends into the material storage cavity (15); The outer lateral wall of the first isolation pipe (4) is provided with a first material guide plate (41) in the circumferential direction, the first material guide plate (41) is arranged obliquely downward, the inner lateral wall of the box (1) is provided with a second material guide plate (16) in the circumferential direction, the second material guide plate (16) is arranged obliquely downward, and after the feed particles are sent out from the upper end of the first isolation pipe (4) by the auger (2), the feed particles fall into the material storage cavity (15) in sequence through the first material guide plate (41) and the second material guide plate (16); The outer lateral wall of the first isolation pipe (4) is provided with a first material guide plate (41) in the circumferential direction, the first material guide plate (41) is arranged obliquely downward, the inner lateral wall of the box (1) is provided with a second material guide plate (16) in the circumferential direction, the second material guide plate (16) is arranged obliquely downward, and after the feed particles are sent out from the upper end of the first isolation pipe (4) by the auger (2), the feed particles fall into the material storage cavity (15) in sequence through the first material guide plate (41) and the second material guide plate (16); The outer lateral wall of the first isolation pipe (4) is rotatably connected with a second isolation pipe (7), the first material guide plate (41) is arranged on the outer lateral wall of the second isolation pipe (7), and the central shaft (21) is provided with a transmission member (5) for driving the second isolation pipe (7) to rotate; The inner lateral wall of the box (1) is provided with a baffle (17), one end of the first material guide plate (41) away from the second isolation pipe (7) is provided with a connecting plate (411), a plug-in slot (171) for inserting the connecting plate (411) is formed in the baffle (17), a plurality of baffles (17) are arranged on the same lateral side of the first material guide plate (41), there is a gap for the feed particles to pass between adjacent baffles (17), and the feed spraying head (13) is arranged at the gap between adjacent two baffles (17); The baffle (17) is provided with a stirring member (6), the stirring member (6) is arranged obliquely, and the oblique direction of the stirring member (6) is parallel to the oblique direction of the first material guide plate (41); The stirring member (6) comprises a stirring ring (61) and a stirring rod (62), the stirring rod (62) is rotatably arranged on the baffle (17), and a plurality of stirring members (6) are arranged at intervals along the extension direction of the baffle (17).

2. A vacuum spray device according to claim 1, wherein: The spray port of the feeding spray head (13) faces the first guide plate (41), and the first guide plate (41) and the second guide plate (16) are both provided with a plurality of guide plates along the length direction of the first isolation pipe (4), and the feeding spray head (13) is provided with a plurality of feeding spray heads corresponding to the first guide plate (41).

3. A vacuum spray device according to claim 2, wherein: The second isolation pipe (7) is provided with a transmission rod (71), one end of the transmission rod (71) away from the second isolation pipe (7) is provided with a transmission ring (72), the transmission ring (72) is rotationally connected to the box (1), the transmission member (5) comprises a first gear (51) coaxially arranged on the outer side wall of the central shaft (21), and a second gear (52) rotationally arranged on the box (1), the inner side wall of the transmission ring (72) is provided with a gear tooth (721), the first gear (51) is engaged with the second gear (52), and the second gear (52) is engaged with the gear tooth (721).

4. A vacuum spray device according to claim 3, wherein: The first isolation pipe (4) is provided with a limiting ring (42) on one side wall facing the second isolation pipe (7), and the second isolation pipe (7) is provided with a limiting groove (73) on one side wall facing the first isolation pipe (4) for sliding of the limiting ring (42).

5. A preparation process of puffed compound feed for Larimichthys crocea, characterized in that, The vacuum spraying device of any one of claims 1-4 is used in a large yellow croaker puffed compound feed preparation process, which comprises the following steps: S1: mixing, mixing and stirring a plurality of feed raw materials; S2: granulation, crushing the raw materials into powder, and then cutting the strip-shaped powder into granular shape; S3: puffing, puffing the granular feed at 120-150 DEG C; S4: spraying, feeding the puffed feed particles into the box (1) of the vacuum spraying device, first vacuumizing the box (1), then conveying the feed particles in the storage cavity (15) upward to the first guide plate (41) through the auger (2), spraying oil mist through the feeding spray head (13), the feed particles pass through the first guide plate (41) and the second guide plate (16) in turn, and the oil mist on the surface of the feed particles is adhered to the inside of the feed particles in the process of sliding downward, then air is introduced into the box (1), and the oil mist on the surface of the feed particles is immersed into the inside of the feed particles under the action of pressure difference; S5: drying, drying the feed particles at 60-80 DEG C; S6: packaging, bagging the dried particles.

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