A dryer for food drying

Abstract

The present invention relates to the technical field of drying equipment, and in particular to a dryer for food drying treatment, comprising a drying box and an air intake pipe connected and installed on the top of the drying box, the air intake pipe is used to extract the air inside the drying box and form a vacuum negative pressure environment inside the drying box, a collecting hopper is arranged on one side of the drying box, the collecting hopper is located at the bottom of the drying box, and a material guiding structure is arranged at the bottom of the collecting hopper and the other side of the drying box, and a bulk plate and a microwave heater are arranged in the drying box; by first freezing the food raw materials and then placing the raw materials in a vacuum negative pressure environment, the sublimation temperature of ice is greatly reduced, the ice is directly sublimated into water vapor, the drying efficiency is improved, and this low-temperature sublimation will not cause thermal damage to the food, and at the same time, the energy required for the sublimation of ice crystals is provided, thereby ensuring the high efficiency of the drying process.

Description

Technical Field

[0001] The present invention relates to the technical field of drying equipment, in particular to a dryer for food drying treatment. Background Art

[0002] In today's rapidly developing food industry, food safety and quality have become the focus of consumers. As one of the important means to maintain food quality and extend shelf life, the importance of food drying technology is self-evident.

[0003] As a healthy food, black garlic has been loved by more and more consumers in recent years. It is transformed from fresh garlic through a long fermentation and maturation process. It not only retains the original nutritional value of garlic, but also produces a unique taste and aroma, as well as higher antioxidant activity. The production process of black garlic also requires a drying process. Traditional drying methods such as natural air drying and sun drying are simple and easy to implement, but they are inefficient and are greatly restricted by weather conditions. It is difficult to meet the requirements of modern food industry for production and quality. When using methods such as high-temperature drying and hot air drying, it is easy to damage the food due to high temperature. Therefore, as people's requirements for food quality become more and more stringent, food drying technology also needs to be continuously innovated. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a dryer for food drying, and the specific technical solution adopted is:

[0005] According to a first aspect of the present invention, there is provided a dryer for food drying, comprising a drying box and an air intake pipe connected and installed on the top of the drying box, the air intake pipe being used to extract the air inside the drying box and to form a vacuum negative pressure environment inside the drying box, a collecting hopper being provided on one side of the drying box, the collecting hopper being located at the bottom of the drying box, a material guiding structure being provided at the bottom of the collecting hopper and the other side of the drying box, a bulk material plate and a microwave heater being provided in the drying box, the bulk material plate being located obliquely below the microwave heater, and the microwave heater being fixed on the top of the drying box.

[0006] Furthermore, the material guiding structure comprises a fixed cylinder obliquely fixed to the side wall of the drying box or the bottom of the collecting hopper, the fixed cylinder is connected to the inside of the drying box, a movable chamber is slidably arranged in the fixed cylinder, and material ports are opened on the upper and lower surfaces of the movable chamber;

[0007] When one end of the movable chamber moves out of the fixed cylinder, one material opening on the movable chamber is located outside the fixed cylinder, and the other material opening is located inside the fixed cylinder. At this time, the inner wall of the fixed cylinder blocks the material opening.

[0008] Furthermore, airbags are provided at both ends of the activity chamber, the airbag on the side of the activity chamber close to the drying box is sealed, and the airbag on the side of the activity chamber away from the drying box is cylindrical and fixedly connected to the activity chamber through a bracket, and external air enters the airbag through the gap on the bracket;

[0009] The activity chamber is connected to the fixed cylinder through an air cylinder, and the air bag on one side of the activity chamber close to the drying box is communicated with the inside of the activity chamber through an air hole.

[0010] Furthermore, a plurality of seesaw plates are arranged on the upper surface of the bulk plate.

[0011] Furthermore, an air chamber is provided at the bottom of the bulk plate, and an air passage is provided on the lower surface of the seesaw plate, and the air passage is connected to the air chamber;

[0012] An air inlet pipe is arranged at the bottom of the drying box, the air inlet pipe is communicated with the air chamber, and a pressure regulating valve is arranged on the air inlet pipe.

[0013] Furthermore, a guide structure and a vibration structure are provided at the bottom of the bulk plate, wherein the vibration structure is used to make the bulk plate vibrate back and forth in its own width direction, and the guide structure is used to provide support and guidance for the bulk plate.

[0014] Furthermore, the vibration structure includes a plurality of slide rails installed at the bottom of the bulk material plate, the length direction of the slide rails is along the inclination direction of the bulk material plate, the plurality of slide rails are arranged along the width direction of the bulk material plate, and a first sliding block is slidably arranged on each bulk material plate;

[0015] The drying box is provided with a first motor, a worm is provided at the output end of the first motor, a plurality of worm wheels are meshedly provided on the worm, the worm wheels are rotatably installed inside the drying box, a shifting post is eccentrically provided on the worm wheels, and the shifting post is connected to the first slider.

[0016] Furthermore, the guide structure includes a guide rail fixed in the drying box, the length direction of the guide rail is parallel to the width direction of the bulk material plate, a second slider is slidably arranged on the guide rail, the second slider is rotatably connected to the bulk material plate through a connecting plate, and the rotation axis of the connecting plate on the second slider and the bulk material plate is along the width direction of the bulk material plate, and a fourth slider is also arranged on the connecting plate;

[0017] A second motor is fixed on the inner wall of the drying box, a threaded rod is provided at the output end of the second motor, a third slider is screwed on the threaded rod, the third slider is rotatably connected with the fourth slider via a connecting arm, and the third slider is transversely slidably installed on the inner wall of the drying box;

[0018] Wherein, a rotating wheel is rotatably arranged on the first sliding block, and the shifting post is fixedly connected to the rotating wheel.

[0019] The beneficial effects of the present invention are:

[0020] By first freezing the food raw materials and then placing them in a vacuum negative pressure environment, the sublimation temperature of ice is greatly reduced, and the ice is directly sublimated into water vapor, which improves the drying efficiency. This low-temperature sublimation will not cause thermal damage to the food, and at the same time provides the energy required for ice crystal sublimation, ensuring the high efficiency of the drying process. The entire drying process is carried out at a low temperature, which can maximize the retention of the color, aroma, taste and nutritional components of the food, avoiding the quality degradation caused by high-temperature treatment. The inclined design of the bulk plate allows the raw materials to be evenly scattered and roll toward the collecting hopper, ensuring the uniformity of heating and evaporation of water vapor of the food raw materials during the drying process, and avoiding the problem of insufficient local drying. The two material guide structures are used for feeding and discharging respectively, and the drying box is kept isolated from the outside world during the feeding and discharging process, realizing a continuous feeding working mode under vacuum sealing conditions, which not only improves production efficiency, but also enables the inside of the drying box to always maintain a vacuum negative pressure environment, avoiding energy loss when the drying box needs to be repeatedly vacuumed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 Schematic diagram of the bottom structure of the drying box in an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the internal structure of a drying box in an embodiment of the present invention;

[0025] Figure 4 is a structural schematic diagram of a material guiding structure in an embodiment of the present invention;

[0026] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of the middle fixed cylinder and the activity chamber;

[0027] Figure 6 is a schematic structural diagram of a bulk material plate in an embodiment of the present invention;

[0028] Figure 7 yes Figure 6 Schematic diagram of the structure viewed from above;

[0029] Figure 8 yes Figure 6 Schematic diagram of the cross-sectional structure of the medium bulk plate;

[0030] Fig. 9 is a schematic structural diagram of a worm wheel and a worm in an embodiment of the present invention;

[0031] Fig.10 yes Figure 7 A schematic diagram of the partially enlarged structure at center A;

[0032] Fig.11 yes Figure 8 Schematic diagram of the local enlarged structure at point B in the middle.

[0033] Reference numerals:

[0034] 1. Drying box; 2. Air suction pipe; 3. Collecting hopper; 4. Material guiding structure; 5. Bulk material plate; 6. Microwave heater; 7. Fixed cylinder; 8. Activity chamber; 9. Material inlet; 10. Bracket; 11. Air bag; 12. Cylinder; 13. Air hole; 14. Rocker; 15. Air chamber; 16. Air duct; 17. Inlet pipe; 18. Pressure regulating valve; 19. Slide rail; 20. First slider; 21. Shifting column; 22. Worm gear; 23. Worm; 24. First motor; 25. Guide rail; 26. Second slider; 27. Connecting plate; 28. Rotating wheel; 29. ​​Second motor; 30. Threaded rod; 31. Third slider; 32. Connecting arm; 33. Fourth slider. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely 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.

[0036] 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”, etc., 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, rather than indicating or implying that the referred device or element 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.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. This embodiment is written in a progressive manner.

[0038] like Figures 1 to 11As shown, a dryer for food drying treatment of the present invention comprises a drying box 1 and an air intake pipe 2 connected and installed on the top of the drying box 1, the air intake pipe 2 is used to extract the air inside the drying box 1 and form a vacuum negative pressure environment inside the drying box 1, a collecting hopper 3 is arranged on one side of the drying box 1, the collecting hopper 3 is located at the bottom of the drying box 1, and a material guiding structure 4 is arranged at the bottom of the collecting hopper 3 and the other side of the drying box 1, a bulk plate 5 and a microwave heater 6 are arranged in the drying box 1, the bulk plate 5 is tilted and located below the microwave heater 6, and the microwave heater 6 is fixed on the top of the drying box 1.

[0039] In detail, the suction pipe 2 can extract the air from the drying box 1 to keep the inside of the drying box 1 in a specified vacuum negative pressure state. The collecting hopper 3 is located on the right side of the bottom of the drying box 1, and the collecting hopper 3 can gather food raw materials and discharge them through the material guiding structure 4 thereon, and another material guiding structure 4 is installed on the side wall of the drying box 1. The material guiding structure 4 is used to supply raw materials to the inside of the drying box 1, and during the process of feeding and discharging of the material guiding structure 4, the drying box 1 remains isolated from the outside world, thereby realizing a continuous feeding working mode under a vacuum sealing state.

[0040] When in use, the food raw materials frozen to a low temperature state are introduced into the bulk plate 5 in the drying box 1 through the material guide structure 4 on the left side of the drying box 1. Since the bulk plate 5 is inclined, the raw materials can be scattered on the bulk plate 5 and roll toward the collecting hopper 3. During this process, the inside of the drying box 1 maintains a vacuum negative pressure state. In this state, the temperature required for sublimation of ice crystals on the raw materials is relatively low. The microwave heater 6 heats the raw materials scattered on the bulk plate 5, thereby providing energy for the sublimation of ice crystals on the raw materials, and the temperature required for heating is relatively low, and will not cause damage to the food. The sublimated water vapor can be sucked away through the suction pipe 2, so that the vacuum negative pressure state is maintained in the drying box 1, thereby realizing the drying of the raw materials. When the food is dried, it moves into the collecting hopper 3 and is discharged through the material guide structure 4 on the collecting hopper 3. Since the food can be continuously fed and discharged through the two material guide structures 4, continuous drying of the food can be achieved.

[0041] By first freezing the food raw materials and then placing them in a vacuum negative pressure environment, the sublimation temperature of ice is greatly reduced, so that ice is directly sublimated into water vapor, the drying efficiency is improved, and this low-temperature sublimation will not cause thermal damage to the food, while providing the energy required for ice crystal sublimation, ensuring the high efficiency of the drying process; the entire drying process is carried out at a low temperature, which can maximize the retention of the color, aroma, taste and nutritional components of the food, avoiding the quality degradation caused by high-temperature treatment, the inclined design of the bulk plate 5 allows the raw materials to be evenly scattered and rolled toward the collecting hopper 3, ensuring the uniformity of heating and evaporation of water vapor of the food raw materials during the drying process, and avoiding the problem of insufficient local drying; the two material guide structures 4 are used for feeding and discharging, respectively, and the drying box 1 is kept isolated from the outside world during the feeding and discharging process, realizing a continuous feeding working mode under vacuum sealing conditions, which not only improves production efficiency, but also enables the inside of the drying box 1 to always maintain a vacuum negative pressure environment, avoiding the energy loss when the drying box 1 needs to be repeatedly vacuumed.

[0042] Furthermore, the material guiding structure 4 comprises a fixed cylinder 7 which is obliquely fixed to the side wall of the drying box 1 or the bottom of the collecting hopper 3, the fixed cylinder 7 is connected to the inside of the drying box 1, a movable chamber 8 is slidably arranged in the fixed cylinder 7, and a material opening 9 is opened on the upper surface and the lower surface of the movable chamber 8;

[0043] When one end of the movable chamber 8 moves out of the fixed cylinder 7 , one material opening 9 on the movable chamber 8 is located outside the fixed cylinder 7 , and the other material opening 9 is located inside the fixed cylinder 7 . At this time, the inner wall of the fixed cylinder 7 blocks the material opening 9 .

[0044] In detail, the fixed cylinder 7 on the side wall of the drying box 1 is directly connected to the inside of the drying box 1, the fixed cylinder 7 at the bottom of the collecting hopper 3 is connected to the drying box 1 through the collecting hopper 3, the inner wall of the fixed cylinder 7 is in contact with the outer wall of the movable chamber 8, and the two material ports 9 on the movable chamber 8 are used for feeding and discharging materials, and when the material port 9 is located inside the fixed cylinder 7, the inner wall of the fixed cylinder 7 will block the material port 9, and there is at least one material port 9 inside the fixed cylinder 7, so that the drying box 1 cannot be connected to the outside through the material guide structure 4, so that the drying box 1 is always kept in an isolated state, and the inside of the drying box 1 is kept in a vacuum negative pressure state. The two material ports 9 are staggered with each other. Taking the material guide structure 4 on the side wall of the drying box 1 as an example, when the feeding When the movable chamber 8 moves away from the end of the drying box 1 to the outside of the fixed cylinder 7, the material port 9 on the upper surface of the movable chamber 8 is located outside the fixed cylinder 7, and the frozen raw materials are introduced into the movable chamber 8 through the material port 9. When the movable chamber 8 slides into the fixed cylinder 7, the inner wall of the fixed cylinder 7 also blocks the material port 9 on the upper surface of the movable chamber 8. When the material port 9 on the lower surface of the movable chamber 8 moves into the drying box 1, the raw materials in the movable chamber 8 can naturally fall onto the bulk plate 5 through the material port 9, thereby realizing the sealed feeding work, and the inclined setting of the fixed cylinder 7 and the movable chamber 8 can help the raw materials to roll naturally, and the material guiding structure 4 at the bottom of the collecting hopper 3 adopts the same method to realize the sealed discharge work.

[0045] Furthermore, airbags 11 are provided at both ends of the activity chamber 8. The airbag 11 on the side of the activity chamber 8 close to the drying box 1 is sealed, and the airbag 11 on the side of the activity chamber 8 away from the drying box 1 is cylindrical and fixedly connected to the activity chamber 8 through a bracket 10. External air enters the airbag 11 through a gap on the bracket 10.

[0046] The movable chamber 8 is connected to the fixed cylinder 7 via an air cylinder 12 , and the air bag 11 of the movable chamber 8 close to the drying box 1 is connected to the inside of the movable chamber 8 via an air hole 13 .

[0047] Detailed, such as Figure 5 As shown, taking the material guiding structure 4 on the left side wall of the drying box 1 as an example, the airbag 11 on the left side of the active chamber 8 is cylindrical in shape, and a bracket 10 is provided on the left opening of the airbag 11, and the bracket 10 is fixedly connected to the side wall of the active chamber 8, thereby supporting the airbag 11 through the bracket 10, while the airbag 11 on the right side of the active chamber 8 is in a sealed state, and the airbag 11 can be connected to the inside of the active chamber 8 through the air hole 13. Of course, the bracket 10 can also be provided on the airbag 11 for support, but the sealing effect of the airbag 11 needs to be maintained so that it cannot be connected to the drying box 1.

[0048] When the left end of the movable chamber 8 is outside the fixed cylinder 7, the movable chamber 8 is in a material receiving state. At this time, the airbag 11 on the right side of the movable chamber 8 is located in the fixed cylinder 7. Since the inside of the drying box 1 is negative pressure, the outside air will enter the movable chamber 8 and enter the right airbag 11 through the air hole 13 on the right side of the movable chamber 8. At this time, the right airbag 11 expands due to the pressure difference, and the outer wall of the airbag 11 is close to the inner wall of the fixed cylinder 7, thereby achieving a secondary sealing effect. When the movable chamber 8 slides into the fixed cylinder 7 and the material port 9 on the lower surface of the movable chamber 8 is located in the drying box 1, the movable chamber 8 The airbag 11 on the left is located in the fixed tube 7, and the outside air will enter the airbag 11 through the bracket 10. When the sealing effect between the active chamber 8 and the fixed tube 7 decreases, since the interior of the active chamber 8 in this state is directly connected to the interior of the drying box 1, the outer wall of the airbag 11 on the left side of the active chamber 8 will be in a negative pressure state, while the inside of the airbag 11 is in a normal pressure state, thereby causing the airbag 11 to expand and adhere tightly to the inner wall of the fixed tube 7. In this way, the expansion effect of the airbag 11 is used to achieve a further sealing effect on the material guiding structure 4, and the material guiding structure 4 on the collecting hopper 3 also has this effect.

[0049] Furthermore, a plurality of seesaw plates 14 are provided on the upper surface of the bulk plate 5 .

[0050] In detail, by providing the seesaw 14 , it is convenient to hinder the raw materials rolling down on the bulk plate 5 , thereby slowing down the rolling speed, and it is convenient to spread the raw materials in the width direction of the bulk plate 5 .

[0051] Furthermore, an air chamber 15 is provided at the bottom of the bulk plate 5, and an air passage 16 is provided on the lower surface of the rocker plate 14, and the air passage 16 is connected to the air chamber 15;

[0052] An air inlet pipe 17 is disposed at the bottom of the drying box 1 . The air inlet pipe 17 is connected to the air chamber 15 . A pressure regulating valve 18 is disposed on the air inlet pipe 17 .

[0053] In detail, when the air suction pipe 2 extracts the air in the drying box 1, the outside air can be supplemented into the drying box 1 through the air inlet pipe 17 and the pressure regulating valve 18. The pressure regulating valve 18 can limit the pressure of the supplementary air, so that the interior of the drying box 1 is always maintained at a specified vacuum negative pressure state, and the air inside the drying box 1 is allowed to circulate. After entering the air chamber 15, the air will be obliquely discharged into the bulk plate 5 through the air duct 16 on the lower side of each rocker 14, thereby utilizing the air flow to blow and dry the raw materials on the bulk plate 5, and the air flow can carry the sublimated water vapor to quickly separate from the raw materials, thereby achieving the working effect of accelerated drying.

[0054] Due to the coordinated use of the seesaw 14 and the air channel 16, when the food rolls from one seesaw 14 to another seesaw 14, the food is in a suspended state. At this time, the air discharged from the air channel 16 will be directly blown to the outer surface of the raw material, thereby realizing a comprehensive aeration working mode for the raw material.

[0055] Furthermore, a guide structure and a vibration structure are provided at the bottom of the bulk plate 5 . The vibration structure is used to make the bulk plate 5 reciprocate in its own width direction, and the guide structure is used to provide support and guidance for the bulk plate 5 .

[0056] In detail, when the raw materials roll down on the bulk plate 5, the vibration structure can make the bulk plate 5 vibrate in its width direction, so that the raw materials can move in the longitudinal direction while rolling down along the inclined direction of the bulk plate 5, which makes it convenient to evenly disperse the raw materials and avoid mutual obstruction, and at the same time can extend the residence time of the raw materials on the bulk plate 5.

[0057] Furthermore, the vibration structure includes a plurality of slide rails 19 installed at the bottom of the bulk plate 5, the length direction of the slide rails 19 is along the inclination direction of the bulk plate 5, and the plurality of slide rails 19 are arranged along the width direction of the bulk plate 5, and a first slider 20 is slidably arranged on each bulk plate 5;

[0058] The drying box 1 is provided with a first motor 24 , and a worm 23 is provided at the output end of the first motor 24 . A plurality of worm wheels 22 are meshedly provided on the worm 23 . The worm wheels 22 are rotatably mounted inside the drying box 1 . A shifting post 21 is eccentrically provided on the worm wheel 22 , and the shifting post 21 is connected to the first slider 20 .

[0059] In detail, the first motor 24 can drive multiple worm gears 22 to rotate synchronously and in the same direction through the worm 23, and the worm gear 22 drives the lever 21 to perform circular motion. The lever 21 pushes the first slider 20 to slide in the length direction of the slide rail 19. At the same time, the lever 21 pushes the bulk plate 5 to reciprocate in the width direction of the bulk plate 5 through the first slider 20 and the slide rail 19, thereby providing power for the vibration of the bulk plate 5.

[0060] Further, the guide structure includes a guide rail 25 fixed in the drying box 1, the length direction of the guide rail 25 is parallel to the width direction of the bulk material plate 5, a second slider 26 is slidably arranged on the guide rail 25, the second slider 26 is rotatably connected to the bulk material plate 5 through a connecting plate 27, and the rotation axes of the connecting plate 27 on the second slider 26 and the bulk material plate 5 are all along the width direction of the bulk material plate 5, and a fourth slider 33 is also arranged on the connecting plate 27;

[0061] A second motor 29 is fixed on the inner wall of the drying box 1, a threaded rod 30 is provided at the output end of the second motor 29, a third slider 31 is screwed on the threaded rod 30, the third slider 31 is rotatably connected to the fourth slider 33 via a connecting arm 32, and the third slider 31 is horizontally slidably installed on the inner wall of the drying box 1;

[0062] A rotating wheel 28 is rotatably disposed on the first sliding block 20 , and the lever 21 is fixedly connected to the rotating wheel 28 .

[0063] In detail, when the bulk plate 5 moves longitudinally, the bulk plate 5 will drive the second slider 26 to slide on the guide rail 25 through the connecting plate 27. At this time, the fourth slider 33 slides on the connecting plate 27. When the pitch angle of the bulk plate 5 needs to be adjusted, the second motor 29 can push the third slider 31 to move through the threaded rod 30. The third slider 31 pushes the connecting plate 27 to rotate on the rotating wheel 28 through the connecting arm 32 and the fourth slider 33, thereby pushing the bulk plate 5 to pitch. The bulk plate 5 will synchronously drive the first slider 20 and the rotating wheel 28 to rotate relative to each other.

[0064] The above is only a preferred embodiment 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 dryer for food drying, characterized in that: The invention comprises a drying box (1) and an air suction pipe (2) connected and installed on the top of the drying box (1), wherein the air suction pipe (2) is used to extract the air inside the drying box (1) and form a vacuum negative pressure environment inside the drying box (1); a collecting hopper (3) is arranged on one side of the drying box (1), the collecting hopper (3) is located at the bottom of the drying box (1), and a material guide structure (4) is arranged at the bottom of the collecting hopper (3) and the other side of the drying box (1); a bulk material plate (5) and a microwave heater (6) are arranged inside the drying box (1), the bulk material plate (5) is inclined and located below the microwave heater (6), and the microwave heater (6) is fixed on the top of the drying box (1); The material guiding structure (4) comprises a fixed cylinder (7) fixed obliquely to the side wall of the drying box (1) or the bottom of the collecting hopper (3), the fixed cylinder (7) being connected to the interior of the drying box (1), a movable chamber (8) being slidably arranged in the fixed cylinder (7), and a material opening (9) being provided on both the upper surface and the lower surface of the movable chamber (8); When one end of the movable chamber (8) moves out of the fixed cylinder (7), one material opening (9) on the movable chamber (8) is located outside the fixed cylinder (7), and the other material opening (9) is located inside the fixed cylinder (7). At this time, the inner wall of the fixed cylinder (7) blocks the material opening (9); Both ends of the activity chamber (8) are provided with airbags (11); the airbag (11) on the side of the activity chamber (8) close to the drying box (1) is sealed, and the airbag (11) on the side of the activity chamber (8) away from the drying box (1) is cylindrical and fixedly connected to the activity chamber (8) via a bracket (10); external air enters the airbag (11) through a gap on the bracket (10); The movable chamber (8) is connected to the fixed cylinder (7) via an air cylinder (12), and the air bag (11) on the side of the movable chamber (8) close to the drying box (1) is connected to the interior of the movable chamber (8) via an air hole (13).

2. A food drying machine according to claim 1, characterized in that: A plurality of seesaw plates (14) are provided on the upper surface of the bulk material plate (5).

3. A food drying machine according to claim 2, characterized in that: An air chamber (15) is provided at the bottom of the bulk plate (5), and an air passage (16) is provided on the lower surface of the seesaw plate (14), wherein the air passage (16) is in communication with the air chamber (15); An air inlet pipe (17) is provided at the bottom of the drying box (1), the air inlet pipe (17) is in communication with the air chamber (15), and a pressure regulating valve (18) is provided on the air inlet pipe (17).

4. A food drying machine according to claim 3, characterized in that: A guide structure and a vibration structure are provided at the bottom of the bulk material plate (5); the vibration structure is used to make the bulk material plate (5) vibrate back and forth in its own width direction; and the guide structure is used to provide support and guidance for the bulk material plate (5).

5. A food drying machine according to claim 4, characterized in that: The vibration structure comprises a plurality of slide rails (19) mounted on the bottom of the bulk material plate (5), the length direction of the slide rails (19) being along the inclination direction of the bulk material plate (5), the plurality of slide rails (19) being arranged along the width direction of the bulk material plate (5), and a first sliding block (20) being slidably disposed on each bulk material plate (5); The drying box (1) is provided with a first motor (24), an output end of the first motor (24) is provided with a worm (23), a plurality of worm wheels (22) are meshedly provided on the worm (23), the worm wheels (22) are rotatably mounted inside the drying box (1), a shifting post (21) is eccentrically provided on the worm wheel (22), and the shifting post (21) is connected to the first slider (20).

6. A food drying machine according to claim 5, characterized in that: The guide structure comprises a guide rail (25) fixed in the drying box (1), the length direction of the guide rail (25) being parallel to the width direction of the bulk material plate (5), a second slider (26) being slidably arranged on the guide rail (25), the second slider (26) being rotatably connected to the bulk material plate (5) via a connecting plate (27), and the rotation axes of the connecting plate (27) on the second slider (26) and the bulk material plate (5) are both along the width direction of the bulk material plate (5), and a fourth slider (33) is also arranged on the connecting plate (27); A second motor (29) is fixed on the inner wall of the drying box (1); a threaded rod (30) is provided at the output end of the second motor (29); a third slider (31) is screwed onto the threaded rod (30); the third slider (31) is rotatably connected to a fourth slider (33) via a connecting arm (32); and the third slider (31) is slidably mounted on the inner wall of the drying box (1) in a transverse manner; A rotating wheel (28) is rotatably disposed on the first sliding block (20), and the shifting post (21) is fixedly connected to the rotating wheel (28).

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