Vacuum drying device

Abstract

The invention discloses a vacuum drying device which comprises a feeding box, a supporting box, a quantitative feeding assembly, a tank body, a feeding air control assembly, a discharging air control assembly and vacuumizing equipment, and the feeding box is arranged on one side of the supporting box; one end of the quantitative feeding assembly communicates with the feeding box, and the other end of the quantitative feeding assembly communicates with the feeding air control assembly. A stirring mechanism and a heating wire are arranged in the tank body; the feeding gas control assembly is arranged at the top of the tank body in a communicating manner; the discharging gas control assembly is arranged at the bottom of the tank body in a communicating manner; and one end of the vacuumizing equipment is communicated with the tank body, so that the vacuum degree and the drying temperature in the tank body can be ensured in the feeding and discharging process of the materials, the frequent vacuumizing and heating of the tank body are not needed, and the vacuum drying efficiency of the materials is improved.

Description

Technical Field

[0001] This application relates to the technical field of drying equipment, and particularly to a vacuum drying device. Background Art

[0002] A vacuum drying device, as a device for drying materials in a vacuum environment, is widely used in multiple fields such as chemical industry, pharmaceuticals, and food. By creating a low-pressure environment, it reduces the boiling point of the moisture in the materials, allows the moisture to quickly vaporize, thereby achieving efficient drying, and at the same time avoids the deterioration of the materials at high temperatures, meeting the stringent requirements for material drying in different industries.

[0003] Currently, during the drying process of the existing vacuum drying device, usually the feeding port of the tank body is first opened, then the materials are put into the tank body, and then a vacuum pumping device is used to extract the air in the tank body. After the extraction is completed, the heating device is controlled to heat the tank body, so as to dry the materials in the tank body. During this process, the vacuum pumping device continuously extracts the moisture in the tank body to complete the vacuum drying of the materials. However, in the above drying method, when feeding and discharging the materials, the tank body needs to be opened, and the vacuum in the tank body will immediately disappear, and a large amount of hot air for drying will also be lost, resulting in frequent work of the vacuum pumping device and the heating device, thus affecting the drying efficiency of the vacuum drying device. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems in the related technologies to some extent.

[0005] Therefore, the purpose of this application is to provide a vacuum drying device that can ensure the vacuum degree and drying temperature in the tank body during the process of material feeding and discharging, so as to avoid frequent vacuum pumping and heating of the tank body, thereby improving the vacuum drying efficiency of the materials.

[0006] To achieve the above purpose, this application provides a vacuum drying device, including a feeding box, a support box, a metering and feeding assembly, a tank body, a feeding air control assembly, a discharging air control assembly, and a vacuum pumping device. Among them, the feeding box is arranged on one side of the support box; one end of the metering and feeding assembly is communicated with the feeding box, and the other end of the metering and feeding assembly is communicated with the feeding air control assembly; a stirring mechanism and heating wires are arranged in the tank body; the feeding air control assembly is communicatively arranged on the top of the tank body; the discharging air control assembly is communicatively arranged on the bottom of the tank body; one end of the vacuum pumping device is communicated with the tank body.

[0007] In addition, the vacuum drying device provided by this application as described above may also have the following additional technical features: In an embodiment of the present application, the feeding air control assembly includes a first control cylinder, a first valve body, and a second valve body. Among them, one end of the first control cylinder is communicated with the quantitative feeding assembly, and the other end of the first control cylinder is communicated with the tank body; the first valve body is arranged on the top of the first control cylinder, and the second valve body is arranged at the bottom of the first valve body.

[0008] In an embodiment of the present application, an air extraction assembly for feeding is communicatively arranged in the middle of the first control cylinder.

[0009] In an embodiment of the present application, the air extraction assembly for feeding includes a first air extraction box, a first electric telescopic rod, a first piston, a first one-way valve, and a second one-way valve. Among them, the first air extraction box is arranged on the support box, and one end of the first air extraction box is communicated with the middle of the first control cylinder; the first electric telescopic rod is arranged on the first air extraction box; the first piston is slidably and sealingly arranged in the first air extraction box, and the extending shaft of the first electric telescopic rod is connected to the first piston; the first one-way valve is arranged at the communication position between the first air extraction box and the first control cylinder; the second one-way valve is arranged on one side of the first air extraction box.

[0010] In an embodiment of the present application, the discharging air control assembly includes a second control cylinder, a third valve body, and a fourth valve body. Among them, the second control cylinder is communicated with the bottom of the tank body; the third valve body is arranged on the top of the second control cylinder, and the fourth valve body is arranged at the bottom of the second control cylinder.

[0011] In an embodiment of the present application, an air extraction assembly for discharging is communicatively arranged in the middle of the second control cylinder.

[0012] In an embodiment of the present application, the air extraction assembly for discharging includes a second air extraction box, a second electric telescopic rod, a second piston, a third one-way valve, and a fourth one-way valve. Among them, the second air extraction box is arranged on the support box, and one end of the second air extraction box is communicated with the middle of the second control cylinder; the second electric telescopic rod is arranged on the second air extraction box; the second piston is slidably and sealingly arranged in the second air extraction box, and the extending shaft of the second electric telescopic rod is connected to the second piston; the third one-way valve is arranged at the communication position between the second air extraction box and the second control cylinder; the fourth one-way valve is arranged on one side of the second air extraction box.

[0013] In an embodiment of the present application, the quantitative feeding assembly includes a quantitative cylinder, a quantitative motor, a fixed shaft, and a plurality of rotating quantitative plates. Among them, one end of the quantitative cylinder is communicated with the feeding box, and the other end of the quantitative cylinder is communicated with the feeding air control assembly; the quantitative motor is arranged on the support box; the fixed shaft is rotatably arranged in the quantitative cylinder, and the output shaft of the quantitative motor is connected to the fixed shaft; one ends of the plurality of rotating quantitative plates are respectively connected to the fixed shaft, and the other ends of the plurality of rotating quantitative plates are respectively slidably connected to the quantitative cylinder.

[0014] In one embodiment of the present application, the stirring mechanism includes a stirring motor and a stirring auger. Among them, the stirring motor is arranged on the tank body; the stirring auger is rotatably arranged in the tank body, and the output shaft of the stirring motor is connected to the stirring auger.

[0015] The beneficial effects of the present application are as follows: Through the settings of the feeding air control component and the discharging air control component, the device can ensure the vacuum degree and drying temperature in the tank body during the feeding and discharging processes of the material, so that it is not necessary to frequently evacuate the vacuum and heat the tank body, thereby improving the vacuum drying efficiency of the material.

[0016] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above-mentioned and / or additional aspects and advantages of the present application will become apparent and easy to understand from the following description of the embodiments in conjunction with the drawings, where: Figure 1 FIG. is a schematic structural diagram of a vacuum drying device according to an embodiment of the present application; Figure 2 FIG. is a schematic sectional structural diagram of a support box according to an embodiment of the present application; Figure 3 FIG. is a schematic structural diagram of a quantitative feeding component according to an embodiment of the present application; Figure 4 FIG. is a schematic sectional structural diagram of a tank body according to an embodiment of the present application; Figure 5 FIG. is a schematic structural diagram of a feeding air extraction component according to an embodiment of the present application; Figure 6 FIG. is a schematic structural diagram of a discharging air extraction component according to an embodiment of the present application.

[0018] As shown in the figure: 1. Loading box; 2. Support box; 3. Quantitative feeding component; 30. Quantitative cylinder; 31. Quantitative motor; 32. Fixed shaft; 33. Rotating quantitative plate; 4. Tank body; 40. Stirring mechanism; 400. Stirring motor; 401. Stirring auger; 41. Heating wire; 5. Feeding air control component; 50. First control cylinder; 51. First valve body; 52. Second valve body; 53. Feeding air extraction component; 530. First air extraction box; 531. First electric telescopic rod; 532. First piston; 533. First one-way valve; 534. Second one-way valve; 6. Discharging air control component; 60. Second control cylinder; 61. Third valve body; 62. Fourth valve body; 63. Discharging air extraction component; 630. Second air extraction box; 631. Second electric telescopic rod; 632. Second piston; 633. Third one-way valve; 634. Fourth one-way valve; 7. Vacuum pumping equipment. Detailed implementation manners

[0019] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application.

[0020] The vacuum drying device of the embodiments of the present application will be described below with reference to the accompanying drawings.

[0021] As Figures 1-6 shown, the vacuum drying device of the embodiments of the present application includes a feeding box 1, a support box 2, a quantitative feeding component 3, a tank body 4, a feeding air control component 5, a discharging air control component 6, and a vacuum pumping device 7.

[0022] Among them, the feeding box 1 is arranged on one side of the support box 2; In the embodiments of the present application, the feeding box 1 is used to hold materials, so as to ensure continuous feeding and continuous drying of the device.

[0023] One end of the quantitative feeding component 3 is communicated with the feeding box 1, and the other end of the quantitative feeding component 3 is communicated with the feeding air control component 5.

[0024] In the embodiments of the present application, the quantitative feeding component 3 is used to transport a fixed number of materials, so as to prevent the situation that there are too many materials in the tank body 4, which affects the drying effect.

[0025] A stirring mechanism 40 and a heating wire 41 are arranged in the tank body 4.

[0026] It can be understood that through the arrangement of the stirring mechanism 40, the materials can be stirred in the tank body 4, so as to improve the drying effect of the materials.

[0027] The feeding air control component 5 is communicatively arranged at the top of the tank body 4.

[0028] In the embodiments of the present application, the feeding air control component 5 is used to block the feeding port of the materials, so as to prevent a large amount of air from entering the tank body 4 when the materials are fed, and prevent the dry hot air from flowing out of the tank body 4.

[0029] The discharging air control component 6 is communicatively arranged at the bottom of the tank body 4.

[0030] In the embodiments of the present application, the discharging air control component 6 is used to block the discharging port of the materials, so as to prevent a large amount of air from entering the tank body 4 when the materials are discharged, and prevent the dry hot air from flowing out of the tank body 4.

[0031] One end of the vacuum pumping device 7 is communicated with the tank body 4.

[0032] It should be noted that the vacuum pumping device 7 described in this embodiment is a common device in the field of vacuum drying technology. It can extract the air in the tank body 4, detect the degree of vacuum, make it in a vacuum state, and can also discharge the dried moisture, so as to ensure the drying effect of the material. The specific structure is the prior art and will not be described in detail here.

[0033] Specifically, during the actual operation process, relevant operators put the material into the feeding box 1, start the device, the quantitative feeding component 3 discharges a fixed amount of material from the feeding box 1, and enters the tank body 4 through the feeding air control component 5. The feeding air control component 5 closes to seal the tank body 4, and the vacuum pumping device extracts the air in the tank body 4 to make the tank body 4 in a vacuum state. The heating wire 41 heats the tank body 4 to make the temperature in the tank body 4 reach the specified temperature.

[0034] After drying is completed, the discharging air control component 6 controls the discharging of the material. And during the discharging process, a large amount of air will not enter the tank body 4, and the heated gas in the tank body 4 will not flow out in large quantities. After the material is discharged, the feeding air control component 5 controls the material to enter the tank body 4, and during the feeding process, a large amount of air will not enter the tank body 4, and the heated gas in the tank body 4 will not flow out in large quantities. In this way, it reciprocates to complete the vacuum drying of the material.

[0035] In an embodiment of the present application, as Figure 2 、 Figure 3 and Figure 4 shown, the feeding air control component 5 includes a first control cylinder 50, a first valve body 51 and a second valve body 52.

[0036] Among them, one end of the first control cylinder 50 is communicated with the quantitative feeding component 3, the other end of the first control cylinder 50 is communicated with the tank body 4, the first valve body 51 is arranged at the top of the first control cylinder 50, and the second valve body 52 is arranged at the bottom of the first valve body 51.

[0037] It should be noted that the first valve body 51 and the second valve body 52 described in this embodiment can be common check valves, ball valves, gate valves, etc. in the market that can be used to seal air. In addition, by arranging the first valve body 51 at the top of the first control cylinder 50 and the second valve body 52 at the bottom of the first control cylinder 50, the material is sealed between the first valve body 51 and the second valve body 52. When feeding into the tank body 4, the second valve body 52 opens and the first valve body 51 remains in a sealed state, so as to reduce the entry of external air into the tank body 4 and reduce the outflow of hot air in the tank body 4. Similarly, when feeding into the first control cylinder 50, the first valve body 51 opens and the second valve body 52 remains in a sealed state. After feeding is completed, the first valve body 51 closes to isolate the entry of air and the dissipation of hot air.

[0038] In one embodiment of the present application, as Figure 4 and Figure 5 shown, an air inlet and extraction assembly 53 is communicatively provided in the middle of the first control cylinder 50.

[0039] In the embodiment of the present application, the air inlet and extraction assembly 53 is used to extract the air between the first valve body 51 and the second valve body 52, so as to further reduce the air entering the tank body 4.

[0040] In one embodiment of the present application, as Figure 1 and Figure 5 shown, the air inlet and extraction assembly 53 includes a first extraction box 530, a first electric telescopic rod 531, a first piston 532, a first one-way valve 533 and a second one-way valve 534.

[0041] Among them, the first extraction box 530 is arranged on the support box 2, one end of the first extraction box 530 is communicatively connected to the middle of the first control cylinder 50, the first electric telescopic rod 531 is arranged on the first extraction box 530, the first piston 532 is slidably and sealingly arranged in the first extraction box 530, the extending shaft of the first electric telescopic rod 531 is connected to the first piston 532, the first one-way valve 533 is arranged at the communicative connection between the first extraction box 530 and the first control cylinder 50, and the second one-way valve 534 is arranged on one side of the first extraction box 530.

[0042] It should be noted that the function of the first one-way valve 533 described in this embodiment is to allow the air in the first control cylinder 50 to enter the first extraction box 530 unidirectionally, and the function of the second one-way valve 534 is to allow the air in the first extraction box 530 to be discharged to the outside of the first extraction box 530, and the installation positions of the first one-way valve 533 and the second one-way valve 534 are not limited, and relevant operators can adjust according to the actual situation.

[0043] It can be understood that through the settings of the first one-way valve 533 and the second one-way valve 534, the air in the first control cylinder 50 can be ensured to be extracted, and the air in the first extraction box 530 can be ensured to be discharged.

[0044] In one embodiment of the present application, as Figure 2 and Figure 4 shown, the discharge air control assembly 6 includes a second control cylinder 60, a third valve body 61 and a fourth valve body 62.

[0045] Among them, the second control cylinder 60 is communicatively connected to the bottom of the tank body 4, the third valve body 61 is arranged at the top of the second control cylinder 60, and the fourth valve body 62 is arranged at the bottom of the second control cylinder 60.

[0046] It should be noted that the third valve body 61 and the fourth valve body 62 described in this embodiment can be common check valves, ball valves, gate valves, etc. on the market, which can be used as valve bodies for sealing air. In addition, by arranging the third valve body 61 at the top of the second control cylinder 60 and the fourth valve body 62 at the bottom of the second control cylinder 60, the material is sealed between the third valve body 61 and the fourth valve body 62. When discharging materials from the second control cylinder 60, the third valve body 61 is opened and the fourth valve body 62 remains in a sealed state, thereby reducing the entry of external air into the tank body 4 and reducing the outflow of hot air from the tank body 4. Similarly, when discharging materials to the outside of the tank body 4, the fourth valve body 62 is opened and the third valve body 61 remains in a sealed state. After the discharging is completed, the fourth valve body 62 is closed, thereby isolating the entry of air and the dissipation of hot air.

[0047] In an embodiment of the present application, as Figure 4 and Figure 6 shown, a discharging and air-extracting assembly 63 is communicatively disposed in the middle of the second control cylinder 60.

[0048] In the embodiment of the present application, the discharging and air-extracting assembly 63 is used to extract the air between the third valve body 61 and the fourth valve body 62, thereby further reducing the entry of air into the tank body 4.

[0049] In an embodiment of the present application, as Figure 2 and Figure 6 shown, the discharging and air-extracting assembly 63 includes a second air-extracting box 630, a second electric telescopic rod 631, a second piston 632, a third one-way valve 633 and a fourth one-way valve 634.

[0050] Among them, the second air-extracting box 630 is disposed on the support box 2. One end of the second air-extracting box 630 is communicatively connected to the middle of the second control cylinder 60. The second electric telescopic rod 631 is disposed on the second air-extracting box 630. The second piston 632 is slidably and sealingly disposed in the second air-extracting box 630. The extending shaft of the second electric telescopic rod 631 is connected to the second piston 632. The third one-way valve 633 is disposed at the communicative connection between the second air-extracting box 630 and the second control cylinder 60. The fourth one-way valve 634 is disposed on one side of the second air-extracting box 630.

[0051] It should be noted that the function of the third one-way valve 633 described in this embodiment is to allow the air in the second control cylinder 60 to enter the second air-extracting box 630 unidirectionally. The function of the fourth one-way valve 634 is to allow the air in the second air-extracting box 630 to be discharged to the outside of the second air-extracting box 630. Moreover, the installation positions of the third one-way valve 633 and the fourth one-way valve 634 are not limited, and relevant operators can adjust them according to actual situations.

[0052] It can be understood that through the setting of the third one-way valve 633 and the fourth one-way valve 634, the air in the second control cylinder 60 can be ensured to be extracted, and the air in the second air extraction box 630 can be ensured to be discharged.

[0053] In an embodiment of the present application, as Figures 1-3 shown, the metering and feeding assembly 3 includes a metering cylinder 30, a metering motor 31, a fixed shaft 32, and a plurality of rotating metering plates 33.

[0054] Among them, one end of the metering cylinder 30 is connected to the feeding box 1, the other end of the metering cylinder 30 is connected to the feeding air control assembly 5, the metering motor 31 is arranged on the support box 2, the fixed shaft is rotatably arranged in the metering cylinder 30, the output shaft of the metering motor 31 is connected to the fixed shaft 32, and one ends of the plurality of rotating metering plates 33 are respectively connected to the fixed shaft 32, and the other ends of the plurality of rotating metering plates 33 are respectively slidably connected to the metering cylinder 30.

[0055] It can be understood that the metering and feeding assembly 3 can use other metering and feeding assemblies 3 on the market, which are not limited herein.

[0056] In an embodiment of the present application, as Figure 4 shown, the stirring mechanism 40 includes a stirring motor 400 and a stirring auger 401.

[0057] Among them, the stirring motor 400 is arranged on the tank body 4, the stirring auger 401 is rotatably arranged in the tank body 4, and the output shaft of the stirring motor 400 is connected to the stirring auger 401.

[0058] It can be understood that through the setting of the stirring auger 401, the materials at the bottom of the tank body 4 can be lifted to prevent the materials from accumulating at the bottom of the tank body 4, and through the rotation of the stirring auger 401, the effect of spreading the materials can be achieved, thereby further improving the drying efficiency of the materials.

[0059] Specifically, during the actual operation process, relevant operators put the materials into the feeding box 1, start the device, the metering and feeding assembly 3 feeds a fixed amount of materials from the feeding box 1, and the materials enter the tank body 4 through the first control cylinder 50. The first valve body 51 and the second valve body 52 seal the first control cylinder 50 and the tank body 4. The vacuum device extracts the air in the tank body 4 to make the tank body 4 in a vacuum state. The heating wire 41 heats the tank body 4 to make the temperature in the tank body 4 reach the specified temperature, and the stirring mechanism 40 stirs the materials.

[0060] After drying is completed, the controller (not shown in the figure) controls the third valve body 61 to open, so that the material enters the second control cylinder 60 and is located above the fourth valve body 62. After the material completely enters, the third valve body 61 closes, the fourth valve body 62 opens, and the material leaks onto the conveyor belt (not shown in the figure). After discharging is completed, the fourth valve body 62 closes, and the second electric telescopic rod 631 contracts to drive the piston to move, thereby drawing the air in the second control cylinder 60 through the third one-way valve 633. After the extraction is completed, the second electric telescopic rod 631 extends to drive the piston to move and discharge the air in the second air extraction box 630 through the fourth one-way valve 634.

[0061] When the material is fed again, the first valve body 51 opens, and the material enters the first control cylinder 50 from the metering and feeding assembly 3 and is located above the second valve body 52. After the material completely enters, the first valve body 51 closes, and the first electric telescopic rod 531 contracts to drive the piston to move, thereby drawing the air in the first control cylinder 50 through the first one-way valve 533. After the extraction is completed, the first electric telescopic rod 531 extends to drive the piston to move, and the air in the first air extraction box 530 is discharged through the second one-way valve 534. At this time, the air in the first control cylinder 50 is drawn away, and the controller controls the second valve body 52 to open, and the material leaks into the tank body 4 and continues to be dried and heated, and so on, thereby completing the vacuum drying of the material.

[0062] In summary, the vacuum drying device according to the embodiment of the present application can ensure the vacuum degree and drying temperature in the tank body during the feeding and discharging process of the material, so that it is not necessary to frequently evacuate and heat the tank body, thereby improving the vacuum drying efficiency of the material.

[0063] In the description of this specification, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0064] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0065] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A vacuum drying device, characterized in that, It includes a feeding box, a support box, a metering and feeding component, a tank body, a feeding air control component, a discharging air control component, and a vacuum pumping device. Among them, the feeding box is arranged on one side of the support box; one end of the metering and feeding component is communicated with the feeding box, and the other end of the metering and feeding component is communicated with the feeding air control component; a stirring mechanism and heating wires are arranged inside the tank body; the feeding air control component is communicatively arranged at the top of the tank body; the discharging air control component is communicatively arranged at the bottom of the tank body; one end of the vacuum pumping device is communicated with the tank body.

2. The vacuum drying device according to claim 1, wherein, The feeding air control component includes a first control cylinder, a first valve body, and a second valve body. Among them, one end of the first control cylinder is communicated with the metering and feeding component, and the other end of the first control cylinder is communicated with the tank body; the first valve body is arranged at the top of the first control cylinder, and the second valve body is arranged at the bottom of the first valve body.

3. The vacuum drying device according to claim 2, wherein An air intake component for feeding is communicatively arranged in the middle of the first control cylinder.

4. The vacuum drying device according to claim 3, wherein, The air intake component for feeding includes a first air extraction box, a first electric telescopic rod, a first piston, a first one-way valve, and a second one-way valve. Among them, the first air extraction box is arranged on the support box, and one end of the first air extraction box is communicated with the middle of the first control cylinder; the first electric telescopic rod is arranged on the first air extraction box; the first piston is arranged in the first air extraction box in a sliding and sealing manner, and the extending shaft of the first electric telescopic rod is connected to the first piston; the first one-way valve is arranged at the communication position between the first air extraction box and the first control cylinder; the second one-way valve is arranged on one side of the first air extraction box.

5. The vacuum drying device according to claim 1, characterized in that, The discharging air control component includes a second control cylinder, a third valve body, and a fourth valve body. Among them, the second control cylinder is communicated with the bottom of the tank body; the third valve body is arranged at the top of the second control cylinder, and the fourth valve body is arranged at the bottom of the second control cylinder.

6. The vacuum drying device according to claim 5, characterized in that, An air extraction component for discharging is communicatively arranged in the middle of the second control cylinder.

7. The vacuum drying device according to claim 6, characterized in that, The air extraction component for discharging includes a second air extraction box, a second electric telescopic rod, a second piston, a third one-way valve, and a fourth one-way valve. Among them, the second air extraction box is arranged on the support box, and one end of the second air extraction box is communicated with the middle of the second control cylinder; the second electric telescopic rod is arranged on the second air extraction box; the second piston is arranged in the second air extraction box in a sliding and sealing manner, and the extending shaft of the second electric telescopic rod is connected to the second piston; the third one-way valve is arranged at the communication position between the second air extraction box and the second control cylinder; the fourth one-way valve is arranged on one side of the second air extraction box.

8. The vacuum drying device according to claim 1, characterized in that, The metering and feeding component includes a metering cylinder, a metering motor, a fixed shaft, and a plurality of rotating metering plates. Among them, one end of the metering cylinder is communicated with the feeding box, and the other end of the metering cylinder is communicated with the feeding air control component; the metering motor is arranged on the support box; the fixed shaft is rotatably arranged inside the metering cylinder, and the output shaft of the metering motor is connected to the fixed shaft; one ends of the plurality of rotating metering plates are respectively connected to the fixed shaft, and the other ends of the plurality of rotating metering plates are respectively slidably connected to the metering cylinder.

9. The vacuum drying device according to claim 1, characterized in that The stirring mechanism includes a stirring motor and a stirring auger, wherein, the stirring motor is arranged on the tank body; the stirring auger is rotatably arranged in the tank body, and the output shaft of the stirring motor is connected to the stirring auger.

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