Energy-saving drying device and energy-saving drying method for fruits and vegetables

Abstract

The invention discloses an energy-saving drying device and an energy-saving drying method for fruits and vegetables, and belongs to the technical field of energy-saving special freeze-drying equipment for fruits and vegetables. The device mainly comprises a feeding bin, a drying bin and a discharging bin which are sequentially arranged, the feeding bin, the drying bin and the discharging bin are communicated with one another and form a drying channel, a plurality of sets of isolation units are arranged in the drying channel, an equipment box is arranged on one side of the drying bin, and an air outlet and an air return opening are formed between the equipment box and the drying bin; vacuum units are arranged between the drying bin and the discharging bin. According to the energy-saving drying device and method for the fruits and the vegetables, the feeding unit, the drying unit and the discharging unit which communicate with one another are arranged, so that assembly line work is formed for freeze drying of the fruits and the vegetables, and rapid and continuous drying, taking and placing actions of the fruits and the vegetables can be formed; and meanwhile, cold air in the drying unit can be conveyed and distributed to the feeding unit and the discharging unit, and therefore the effects of feeding pre-drying and discharging heat preservation are achieved.

Description

Technical Field

[0001] This application relates to the technical field of energy-saving fruit and vegetable freeze-drying equipment, specifically an energy-saving fruit and vegetable drying device and an energy-saving drying method. Background Technology

[0002] Fruits and vegetables are rich in nutrients such as vitamins, minerals and dietary fiber, and are an important part of the human diet. However, fresh fruits and vegetables have a high water content, usually between 70% and 95%. If they are not processed in time after harvesting, they are susceptible to microbial infection and spoilage, resulting in a large waste of resources. Therefore, drying fruits and vegetables is a key means to extend their shelf life and improve the convenience of storage and transportation. Existing fruit and vegetable drying technologies mainly include hot air drying, vacuum drying, freeze drying, and microwave drying. Among them, freeze drying can improve the quality of dried fruits and vegetables to a certain extent and reduce the loss of nutrients. For example, patent CN118901778A discloses a freeze-drying device for dehydrating and preserving fruits and vegetables. The patent includes a base plate, a U-shaped fixing frame, and a belt conveyor. The U-shaped fixing frame is symmetrically fixed to the front and back of the top left side of the base plate. The belt conveyor is slidably connected between the two U-shaped fixing frames. The belt conveyor is fixedly connected to the front and back sides of the front and back sides. In use, the fruits and vegetables are laid on three placement frames to make the fruits and vegetables evenly distributed, thereby improving the freezing effect. Since the fruits and vegetables are loaded in layers, they are not easily damaged, thus improving the quality of the freeze-dried fruits and vegetables. After lifting the second sealing plate, the three placement frames are tilted in sequence, which allows the freeze-dried fruits and vegetables to be unloaded. Although the aforementioned patent achieves freeze-drying of fruits and vegetables, the freezer compartment is always open during the process of placing and removing fruits and vegetables because the placement frame is integrated with the freezer compartment. Due to the multi-layered placement frame, a lot of time is spent on placing and removing fruits and vegetables, resulting in a significant waste of cold air, which does not meet the requirements of industrial energy conservation. Therefore, it is necessary to provide an energy-saving fruit and vegetable drying device and method to solve the above problems.

[0003] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0004] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide an energy-saving drying device and method for fruits and vegetables, which solves the problem of a large amount of cold air wasted due to the excessive time spent taking fruits and vegetables out of and out of the freezer.

[0005] The technical solution adopted by this application to solve its technical problem is: an energy-saving drying device for fruits and vegetables, including a feeding bin, a drying bin and a discharging bin arranged sequentially along the path of drying fruits and vegetables. The feeding bin, drying bin and discharging bin are interconnected and arranged sequentially along a straight line to form a complete drying channel. A support unit is provided in the drying channel, and the support unit has a support rack for placing fruits and vegetables; Isolation units are installed between the feeding hopper and the drying hopper, between the drying hopper and the unloading hopper, and on the outside of the feeding hopper and the unloading hopper. An equipment box is provided on one side of the drying chamber. The equipment box contains a refrigeration system and multiple sets of fans. An air outlet and an air return outlet are provided between the equipment box and the drying chamber. Vacuum pipes are installed between the feeding hopper and the drying hopper, and between the drying hopper and the unloading hopper, and vacuum pumps are installed on the vacuum pipes.

[0006] Furthermore, the bottom of the support frame is equipped with wheels, and three sets of mutually separate walking units are arranged inside the drying channel; The walking unit includes four sets of bases fixedly installed at both ends of the bottom. Each of the four sets of bases is rotatably mounted with a driven sprocket. A connecting shaft is fixedly installed between two sets of driven sprockets on the same side. A chain is driven between the two sets of driven sprockets at the two ends. A motor is fixedly installed at one end of the bottom, and a drive sprocket is fixedly installed at the output end of the motor. A set of transition sprockets is fixedly installed on the connecting shaft near the motor, and a transmission chain is provided between the transition sprockets and the drive sprocket. Multiple sets of protruding plates are fixedly installed at the upper end of the chain, an extension plate is fixedly installed at the bottom of the support frame, a hinge plate is hinged to the bottom of the extension plate, and a torsion spring is installed between the extension plate and the hinge plate.

[0007] Furthermore, three sets of separate tracks are provided at the bottom of the drying channel, and the tracks are matched with the traveling wheels.

[0008] Furthermore, transition ramps are provided at both ends of the track.

[0009] Furthermore, a slot is provided on one side of the hinge plate, and the slot matches the protrusion plate.

[0010] Furthermore, the multiple sets of protruding plates are evenly distributed along the transmission direction of the chain.

[0011] Furthermore, the isolation unit has columns disposed on both sides and connected to the inner wall of the drying channel, and isolation doors are hinged to both columns. The two columns are provided with an installation cavity on the side near the inner wall of the drying channel. Multiple sets of springs are fixedly installed inside the installation cavity along the height direction. A support plate is fixedly installed at the other end of the spring. The support plate is slidably disposed in the installation cavity. An eccentric wheel is rotatably mounted inside the mounting cavity, and one end of the eccentric wheel extends to the outer end of the column and is provided with a locking handle.

[0012] Furthermore, an extension frame extending to both ends is fixedly installed at the bottom of the column, and rollers are rotatably installed on the extension frame.

[0013] Furthermore, a sealing curtain is provided at the bottom center of both the isolation door and the extension frame.

[0014] An energy-saving drying method for a fruit and vegetable energy-saving drying device includes the following steps: Step one: The isolation unit on one side of the feeding hopper is opened, and the carrying rack fully loaded with fruits and vegetables is pushed into the feeding hopper by the staff. Step 2: The isolation unit on one side of the feeding hopper is closed, and the isolation unit between the feeding hopper and the drying hopper is opened. The carrying rack fully loaded with fruits and vegetables enters the drying hopper from the feeding hopper. Step 3: Through the refrigeration system and fan, low-temperature air is forced into the drying chamber to freeze the fruits and vegetables for a certain period of time. During the freezing process, the isolation unit on one side of the loading chamber is opened, the load rack full of fruits and vegetables is pushed into the loading chamber, and the corresponding isolation unit is closed. Step 4: After the temperature has cooled for a sufficient time, turn on the vacuum pump to evacuate the drying chamber. After the extracted cold air is dried, it is stored in the loading and unloading hoppers. Step 5: After the fruits and vegetables are dried, open the isolation units between the feeding hopper and the drying hopper, as well as between the drying hopper and the unloading hopper. Then, the dried fruits and vegetables enter the unloading hopper, and the fruits and vegetables in the feeding hopper enter the drying hopper. Then, close the corresponding isolation units. Step 6: During the drying process of the second batch of fruits and vegetables, open the isolation units outside the feeding hopper and the unloading hopper at the same time. At this time, take out the fruits and vegetables in the unloading hopper and push the new fruits and vegetables into the feeding hopper. Then close the corresponding isolation units. Step 7: Repeat steps 4 to 6 to achieve automated drying of fruits and vegetables.

[0015] The beneficial effects of this application are as follows: The energy-saving drying device and method for fruits and vegetables provided in this application, by setting up an interconnected feeding unit, drying unit and unloading unit, enables the freeze drying of fruits and vegetables to form an assembly line operation, so as to form a fast and continuous fruit and vegetable drying and loading and unloading action. At the same time, by setting up a vacuum unit, the cold air in the drying unit can be transported and distributed to the feeding unit and the unloading unit, thereby achieving the effects of pre-drying of the feeding and heat preservation of the unloading, thereby improving the utilization rate of cold air.

[0016] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is an overall schematic diagram of an energy-saving fruit and vegetable drying device and energy-saving drying method according to this application; Figure 2 for Figure 1 A cross-sectional view of the overall structure; Figure 3 for Figure 2 A partial structural diagram at point A in the middle; Figure 4 for Figure 3 A schematic diagram of the overall structure of the central isolation unit; Figure 5 for Figure 4 A schematic diagram of the partial structure at point B in the middle; Figure 6 for Figure 2 A partial structural diagram of the load-bearing unit and the traveling unit; Figure 7 for Figure 6 A schematic diagram of the partial structure at point C in the middle; Figure 8 for Figure 7 A schematic diagram of the partial structure at point D; Figure 9 for Figure 4 Overall schematic diagram of the central column structure; Figure 10 for Figure 9 A partial structural diagram at point E in the middle; Figure 11 for Figure 9 Exploded view of the central column structure; Figure 12 for Figure 11 Schematic diagram of the partial structure at point F in the middle; The following are the labeling elements in the figure: 1. Refrigeration unit; 11. Equipment box; 12. Return air vent; 13. Air outlet; 2. Feeding unit; 21. Feeding box; 3. Unloading unit; 31. Unloading box; 4. Drying unit; 41. Drying oven; 5. Bearing unit; 51. Bearing frame; 52. Traveling wheel; 53. Extension plate; 54. Hinge plate; 541. Slot; 6. Isolation unit; 61. Column; 62. Isolation door; 63. Extension frame; 64. Roller; 65. Sealing curtain; 66. Mounting cavity; 67. Eccentric wheel; 68. Support plate; 69. Sealing gasket; 610. Lock handle; 611. Spring; 7. Walking unit; 71. Motor; 72. Base; 73. Driven sprocket; 74. Chain; 75. Drive sprocket; 76. Connecting shaft; 77. Track; 78. Protruding plate; 79. Transmission chain; 710. Transition sprocket; 8. Vacuum unit; 81. Vacuum tube; 82. Vacuum pump. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application. Example

[0020] This embodiment mainly describes the equipment used for freeze-drying fruits and vegetables and its working principle, specifically: like Figures 1-4As shown, this application provides an energy-saving fruit and vegetable drying device, including a feeding unit 2, a drying unit 4, and a discharging unit 3 arranged sequentially along the fruit and vegetable drying path. The feeding unit 2 has a feeding box 21, which is hollow inside and forms a feeding hopper. The drying unit 4 has a drying box 41, which is hollow inside and forms a drying hopper. The discharging unit 3 has a discharging box 31, which is hollow inside and forms a discharging hopper. In this application, the feeding hopper, drying hopper, and discharging hopper are interconnected and arranged sequentially along a straight line to form a complete drying channel. Meanwhile, a support unit 5 is provided in the drying channel. The support unit 5 has a support rack 51 for placing fruits and vegetables. The support rack 51 has multiple support plates so that fruits and vegetables can be evenly placed in multiple layers along the height direction on the support rack 51, which facilitates uniform drying in the subsequent process. Furthermore, isolation units 6 are provided between the feeding hopper and the drying hopper, between the drying hopper and the unloading hopper, and on the outside of the feeding hopper and the unloading hopper, so as to isolate or connect the hoppers. The isolation unit 6 has columns 61 on both sides and connected to the inner wall of the drying channel. Isolation doors 62 are hinged on both columns 61, so that the isolation doors 62 are adapted to rotate around the columns 61 to open or close the corresponding drying channel. Continue to refer to Figures 1-4 A refrigeration unit 1 is provided on one side of the drying unit 4. The refrigeration unit 1 has an equipment box 11, and an air outlet 12 and an air return vent 13 are provided between the equipment box 11 and the drying chamber (see reference). Figure 9 The air outlet 12 is located at the lower end of the return air outlet 13 so that the downward characteristic of cold air can be utilized to accelerate the replacement of cold air. It should be noted that the internal temperature of the equipment box 11 is reduced to an ultra-low temperature range of -30℃ to -40℃ through a refrigeration system (compressor, condenser, evaporator, etc.), providing the basic conditions for rapid freezing. At the same time, the equipment box 11 is equipped with multiple sets of high-efficiency fans, which will force the low-temperature air at a speed of 3~6m / s to the fruits and vegetables placed on the support rack 51 in the freezer compartment. The airflow will pass evenly through the gaps between the fruits and vegetables, ensuring that the fruits and vegetables placed on the support rack 51 can be cooled from all directions, achieving uniform freezing and avoiding local incomplete freezing or over-freezing. In this application, in order to create a vacuum environment in the drying chamber to significantly lower the boiling point of water, such as Figures 1-2As shown, a vacuum unit 8 is provided between the feeding hopper and the drying hopper, and between the drying hopper and the unloading hopper. The vacuum unit 8 includes a vacuum tube 81 that connects the feeding hopper and the drying hopper (between the drying hopper and the unloading hopper). A vacuum pump 82 is provided on the vacuum tube 81, so that the drying hopper can be evacuated by the vacuum pump 82, and the extracted gas can be temporarily stored in the feeding hopper and the unloading hopper respectively. It should be noted that a drying component is provided on the vacuum tube 81 to dry the extracted gas flow. The following details the freeze-drying process for fruits and vegetables: Step 1: The isolation unit 6 on one side of the feeding hopper is opened. At this time, the carrying rack 51, which is fully loaded with fruits and vegetables, is pushed into the interior of the feeding hopper by the staff. Step 2: The isolation unit 6 on one side of the feeding hopper is closed, and the isolation unit 6 between the feeding unit 2 and the drying unit 4 is opened, allowing the fully loaded fruit and vegetable support rack 51 to enter the drying hopper from the feeding hopper. Step 3: Low-temperature air is forced into the drying chamber by the freezing unit 1, so that the fruits and vegetables are frozen at low temperature for a certain period of time, and the water in the fruits and vegetables exists in the form of ice. During the freezing process of this group of fruits and vegetables, the isolation unit 6 on the side of the feeding chamber can be opened, and another set of fully loaded fruit and vegetable support racks 51 can be pushed into the feeding chamber, and the corresponding isolation unit 6 can be closed. Step 4: After sufficient cooling time, open vacuum unit 8 to vacuum the drying chamber, allowing ice to sublimate directly into water vapor at a lower temperature. The water on the frozen fruits and vegetables sublimates directly into water vapor, which is then extracted by vacuum pump 82. This achieves the freeze-drying effect on the fruits and vegetables. The extracted cold air is dried and stored in the loading and unloading hoppers. The cold air drawn into the loading hopper can be used to pre-cool and dry another batch of fruits and vegetables, while the cold air drawn into the unloading hopper can be used to keep the fruits and vegetables warm, thus achieving the recycling of cold air and achieving energy saving. Step 5: After the first batch of fruits and vegetables is dried, the isolation unit 6 between the feeding hopper and the drying hopper, and between the drying hopper and the unloading hopper, is opened simultaneously. Then, the first batch of fruits and vegetables enters the unloading hopper, and the second batch of fruits and vegetables enters the drying hopper. Then, the corresponding isolation unit 6 is closed. Because both the feeding hopper and the drying hopper are pre-stored with cold air, the temporary connection will not cause the temperature of the drying hopper to drop suddenly. As a result, the temperature in the drying hopper can quickly reach the preset temperature during the subsequent drying process, thereby achieving the effect of energy saving. Step 6: During the drying process of the second group of fruits and vegetables, open the isolation unit 6 outside the feeding hopper and the unloading hopper at the same time. At this time, take out the first group of fruits and vegetables from the unloading hopper and push the third group of fruits and vegetables into the feeding hopper. Then close the corresponding isolation unit 6. Step 7: Repeat steps 4-6 to achieve automated drying of fruits and vegetables. Example

[0021] To enable the movement of the support frame 51 within the drying channel, such as Figure 3 and Figures 6-8 As shown, a traveling wheel 52 is provided at the bottom of the support frame 51, which helps the support frame 51 move smoothly in the drying channel; In order to drive the movement of the walking wheels 52, three sets of mutually separated walking units 7 are set inside the drying channel. The three sets of walking units 7 are respectively set in the feeding bin, the drying bin and the unloading bin, so as to realize the autonomous movement of the support frame 51. The following section uses the traveling unit 7 in the upper hopper as an example to introduce the structure and principle of the traveling unit 7, specifically: The walking unit 7 includes four sets of bases 72 fixedly installed at both ends of the bottom. Each of the four sets of bases 72 is rotatably mounted with a driven sprocket 73, and a connecting shaft 76 is fixedly installed between two sets of driven sprockets 73 on the same side. Thus, when the connecting shaft 76 rotates, it can drive the two sets of driven sprockets 73 on the same side to rotate synchronously. Meanwhile, a chain 74 is provided between the two sets of driven sprockets 73 at both ends, which can transmit power when the driven sprockets 73 rotate; A motor 71 is fixedly installed at one end of the bottom. A drive sprocket 75 is fixedly installed at the output end of the motor 71. A transition sprocket 710 is fixedly installed on one of the connecting shafts 76 near the motor 71. A transmission chain 79 is provided between the transition sprocket 710 and the drive sprocket 75. When the drive sprocket 75 rotates under the drive of the motor 71, it will synchronously drive the transition sprocket 710 to rotate, thereby driving the connecting shaft 76 to rotate. When the connecting shaft 76 rotates, it will drive the chain 74 through the driven sprocket 73 for transmission. Continue to refer to Figure 3 Multiple sets of protruding plates 78 are fixedly installed at the upper end of the chain 74. The multiple sets of protruding plates 78 are evenly distributed along the transmission direction of the chain 74. At the same time, an extension plate 53 is fixedly installed at the bottom of the support frame 51. A hinge plate 54 is hinged to the bottom of the extension plate 53. The hinge plate 54 is adapted to contact the protruding plates 78. Meanwhile, a torsion spring is installed between the extension plate 53 and the hinge plate 54. The torsion spring makes the hinge plate 54 vertical when it is not under force, and the hinge plate 54 is restricted by the extension plate 53 to rotate only in one direction. Understandably, when chain 74 is along Figure 3 When the arrow is in the direction of transmission, it will drive the convex plate 78 to drive synchronously. At this time, the convex plate 78 contacts and abuts the hinge plate 54. Because the hinge plate 54 cannot rotate due to the restriction of the extension plate 53, the hinge plate 54 will drive the bearing frame 51 to move synchronously under the abutment of the convex plate 78. Therefore, when the chain 74 is driven, it can drive the support frame 51 to move synchronously in the drying channel. When the support frame 51 moves relative to the chain 74, the hinge plate 54 rotates in one direction, causing the hinge plate 54 to avoid the stationary convex plate 78, thereby completing the loading and unloading of the support frame 51. After loading or unloading is completed, the hinge plate 54 will reset under the action of the torsion spring.

[0022] In this embodiment, in order to make the support frame 51 move in a straight line, such as Figure 3 As shown, three sets of separate tracks 77 are provided at the bottom of the drying channel. The tracks 77 are matched with the walking wheels 52, so that the walking wheels 52 can move on the tracks 77. It should be noted that because the track 77 is segmented, transition ramps (not shown in the figure) are provided at both ends of the track 77. These transition ramps allow the traveling wheels 52 to transition smoothly. Furthermore, in order to ensure that the traveling wheel 52 can still travel in a straight line at the connection point of the two sets of tracks 77, such as... Figure 8 As shown, a slot 541 is provided on one side of the hinge plate 54. The slot 541 matches the protrusion 78, so that the protrusion 78 can be inserted into the slot 541. During the process of driving the support frame 51 to move, the support frame 51 always maintains a straight line movement due to the restriction of the slot 541. In this embodiment, because multiple sets of convex plates 78 are evenly distributed along the transmission direction of the chain 74, when the support frame 51 switches between the two sets of walking units 7, they form an alternating connection and will not stop due to the segmented arrangement of the walking units 7. Example

[0023] In order to freeze-dry different quantities of fruits and vegetables, different lengths of support racks 51 are usually used. When the length of the support rack 51 is adjusted, if the volume of the drying chamber remains unchanged, the consumption of cold air will inevitably increase, which is not conducive to energy conservation and emission reduction. To solve the above problems, the isolation unit 6 is configured to be position-adjustable, specifically: like Figures 9-12 As shown, an installation cavity 66 is provided on one side of the two columns 61 near the inner wall of the drying channel. Multiple sets of springs 611 are fixedly installed inside the installation cavity 66 along the height direction. A support plate 68 is fixedly installed at the other end of the spring 611. The support plate 68 is slidably disposed in the installation cavity 66, so that the support plate 68 can be close to or away from the inner wall of the drying channel. Meanwhile, an eccentric wheel 67 is rotatably installed inside the mounting cavity 66. One end of the eccentric wheel 67 extends to the outer end of the column 61 and is provided with a locking handle 610. Thus, when the locking handle 610 rotates, it can drive the eccentric wheel 67 to rotate, and the arc surface of the eccentric wheel 67 is always in contact with the abutment plate 68. For ease of explanation, the arc on the eccentric wheel 67 closest to the rotating shaft is defined as the relaxation arc, and the arc farthest from the rotating shaft is defined as the locking arc. Thus, when the relaxation arc contacts the abutment plate 68, the abutment plate 68 moves away from the inner wall of the drying channel, thereby putting the isolation unit 6 in a relaxed state. At this time, the operator can move the position of the isolation unit 6. When the locking arc contacts the abutment plate 68, the abutment plate 68 is pressed against the inner wall of the drying channel, thereby locking the isolation unit 6. At this time, the isolation unit 6 is in a fixed state. By loosening and locking the isolation unit 6 as described above, the position of the isolation unit 6 can be adjusted arbitrarily, thereby adjusting the volume of the drying chamber. It should be noted that because of the segmented setting of the walking unit 7, the isolation unit 6 has a certain range of adjustment space. Furthermore, a sealing gasket 69 is provided at the position of the support plate 68 near the inner wall of the drying channel, which can increase the sealing performance of the contact between the support plate 68 and the support plate 68.

[0024] To facilitate the movement of isolation unit 6, such as Figure 9 and Figure 11 As shown, an extension frame 63 extending to both ends is fixedly installed at the bottom of the column 61. A roller 64 is rotatably installed on the extension frame 63, so that the isolation unit 6 can be moved by the rolling of the roller 64. In order to increase the sealing of the isolation unit 6, a sealing curtain 65 is provided at the bottom middle position of the isolation door 62 and the extension frame 63 to reduce the gas flow between the compartments, thereby reducing heat exchange and achieving energy saving.

[0025] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An energy-saving drying device for fruits and vegetables, characterized in that: include: Along the fruit and vegetable drying path, the feeding silo, drying silo, and unloading silo are set up in sequence. The feeding silo, drying silo, and unloading silo are interconnected and arranged in a straight line to form a complete drying channel. A support unit (5) is provided in the drying channel, and the support unit (5) has a support rack (51) for placing fruits and vegetables. Isolation units (6) are provided between the feeding hopper and the drying hopper, between the drying hopper and the unloading hopper, and on the outside of the feeding hopper and the unloading hopper. An equipment box (11) is provided on one side of the drying chamber. The equipment box (11) is equipped with a refrigeration system and multiple sets of fans. An air outlet (12) and an air return outlet (13) are provided between the equipment box (11) and the drying chamber. Vacuum pipes (81) are installed between the feeding hopper and the drying hopper, and between the drying hopper and the unloading hopper. Vacuum pumps (82) are installed on the vacuum pipes (81).

2. The energy-saving fruit and vegetable drying device according to claim 1, characterized in that: The bottom of the support frame (51) is provided with a walking wheel (52), and three sets of mutually separated walking units (7) are provided inside the drying channel. The walking unit (7) includes four sets of bases (72) fixedly installed at both ends of the bottom. Each of the four sets of bases (72) is rotatably mounted with a driven sprocket (73). A connecting shaft (76) is fixedly installed between two sets of driven sprockets (73) on the same side. A chain (74) is driven between the two sets of driven sprockets (73) at both ends. A motor (71) is fixedly installed at one end of the bottom. A drive sprocket (75) is fixedly installed at the output end of the motor (71). A set of transition sprockets (710) are fixedly installed on the connecting shaft (76) near the motor (71). A transmission chain (79) is provided between the transition sprockets (710) and the drive sprockets (75). The upper end of the chain (74) is fixedly installed with multiple sets of protruding plates (78), the bottom of the support frame (51) is fixedly installed with an extension plate (53), the bottom of the extension plate (53) is hinged with a hinge plate (54), and a torsion spring is installed between the extension plate (53) and the hinge plate (54).

3. The energy-saving fruit and vegetable drying device according to claim 2, characterized in that: Three sets of separate tracks (77) are provided at the bottom of the drying channel, and the tracks (77) are matched with the walking wheels (52).

4. The energy-saving fruit and vegetable drying device according to claim 3, characterized in that: Both ends of the track (77) are provided with transition ramps.

5. The energy-saving fruit and vegetable drying device according to claim 4, characterized in that: A slot (541) is provided on one side of the hinge plate (54), and the slot (541) matches the protrusion plate (78).

6. The energy-saving fruit and vegetable drying device according to claim 5, characterized in that: Multiple sets of the convex plates (78) are evenly distributed along the transmission direction of the chain (74).

7. The energy-saving fruit and vegetable drying device according to claim 1, characterized in that: The isolation unit (6) has columns (61) arranged on both sides and connected to the inner wall of the drying channel, and isolation doors (62) are hinged on both sides of the columns (61). The two columns (61) are provided with an installation cavity (66) on the side near the inner wall of the drying channel. Multiple sets of springs (611) are fixedly installed inside the installation cavity (66) along the height direction. A support plate (68) is fixedly installed at the other end of the spring (611). The support plate (68) is slidably disposed in the installation cavity (66). An eccentric wheel (67) is rotatably mounted inside the mounting cavity (66), one end of which extends to the outer end of the column (61) and is provided with a locking handle (610).

8. The energy-saving fruit and vegetable drying device according to claim 7, characterized in that: The bottom of the column (61) is fixedly installed with an extension frame (63) extending to both ends, and a roller (64) is rotatably installed on the extension frame (63).

9. The energy-saving fruit and vegetable drying device according to claim 8, characterized in that: A sealing curtain (65) is provided at the bottom center of the isolation door (62) and the extension frame (63).

10. The energy-saving drying method of the fruit and vegetable energy-saving drying device according to claim 1, characterized in that: Includes the following steps: Step 1: The isolation unit (6) on one side of the feeding hopper is opened. At this time, the carrying rack (51) full of fruits and vegetables is pushed into the interior of the feeding hopper by the staff. Step 2: The isolation unit (6) on one side of the feeding hopper is closed, and the isolation unit (6) between the feeding hopper and the drying hopper is opened. The carrying rack (51) fully loaded with fruits and vegetables enters the drying hopper from the feeding hopper. Step 3: Through the refrigeration system and fan, low-temperature air is forced to blow into the fruits and vegetables in the drying chamber, so that the fruits and vegetables are frozen at low temperature for a certain period of time. During the freezing process of fruits and vegetables, the isolation unit (6) on one side of the loading chamber is opened, the carrying rack (51) full of fruits and vegetables is pushed into the loading chamber, and the corresponding isolation unit (6) is closed. Step 4: After the temperature has cooled for a sufficient time, turn on the vacuum pump (82) to vacuum the drying chamber, dry the extracted cold air, and store it in the loading and unloading chambers. Step 5: After the fruits and vegetables are dried, open the isolation units (6) between the feeding hopper and the drying hopper, and between the drying hopper and the unloading hopper. Then the dried fruits and vegetables enter the unloading hopper, and the fruits and vegetables in the feeding hopper enter the drying hopper. Then close the corresponding isolation units (6). Step 6: During the drying process of the second batch of fruits and vegetables, open the isolation units (6) on the outside of the feeding hopper and the unloading hopper at the same time. At this time, take out the fruits and vegetables in the unloading hopper and push the new fruits and vegetables into the feeding hopper. Then close the corresponding isolation units (6). Step 7: Repeat steps 4 to 6 to achieve automated drying of fruits and vegetables.

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