A hot air circulating oven for drying capsules
By designing a hot air delivery component and a clean air system in the hot air circulating oven, the problems of uneven hot air and contamination were solved, achieving uniformity and quality improvement in capsule drying and increasing the yield.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN MEDSHINE PHARM CO
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-14
AI Technical Summary
Existing hot air drying ovens suffer from uneven hot air circulation, resulting in significant differences in capsule drying levels. Furthermore, impurities and bacteria in the air can easily contaminate the capsules, reducing the yield of finished products.
A hot air circulating oven for capsule drying was designed. Hot air is evenly distributed in the drying chamber through a hot air conveying component. Clean air is used and treated by an air purification device. Multiple sets of hot air inlets and hot air passage holes with screens are combined to ensure that the hot air contacts the capsules evenly. An exhaust pipe is set up to discharge the hot and humid air.
This method achieves uniformity and quality improvement in capsule drying, avoids capsule contamination, and increases yield and drying efficiency.
Smart Images
Figure CN224498950U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drying equipment technology, specifically to a hot air circulating oven for capsule drying. Background Technology
[0002] In capsule manufacturing, the drying process plays a crucial role in product quality. Capsules are typically made from materials such as gelatin and plant cellulose. Before filling with medication, it is essential to ensure that their moisture content is within the appropriate range to guarantee the capsule's physical properties, stability, and the medication's shelf life. Insufficient drying may lead to problems such as capsule deformation, adhesion, and microbial growth, affecting the filling and storage of the medication; while excessive drying may cause the capsules to crack, reducing the product's pass rate.
[0003] Currently, capsules are typically dried using hot air ovens. However, due to poorly designed hot air circulation systems, these ovens are prone to uneven temperature distribution, resulting in significant differences in drying levels across different locations. Capsules near the hot air inlet may be over-dried, while those further away may be under-dried, leading to a lower capsule yield. Furthermore, most current hot air ovens use air directly as their input source, making them susceptible to contamination from airborne impurities and bacteria, further reducing the capsule yield.
[0004] Therefore, there is an urgent need for a hot air circulating oven for capsule drying that can distribute hot air more evenly. Utility Model Content
[0005] Based on this, and in response to the above problems, this utility model proposes a hot air circulating oven for capsule drying, which solves the problem of large differences in capsule drying caused by uneven hot air circulation in current hot air ovens.
[0006] The technical solution of this utility model is:
[0007] A hot air circulating oven for capsule drying includes a drying chamber, an outer chamber, a mounting cabinet, and a hot air conveying assembly. The drying chamber is disposed inside the outer chamber and is fixedly connected to the outer chamber. The outer chamber is disposed on the mounting cabinet and is fixedly connected to the top of the mounting cabinet.
[0008] The top of the drying chamber is equipped with a hot air exhaust pipe. One end of the hot air exhaust pipe is connected to the inside of the drying chamber, and the other end passes through the outer chamber and extends to the outside of the outer chamber. Hot air flow chambers are provided between the two sides of the drying chamber and the outer chamber. Several hot air flow ports are provided on the two sides of the drying chamber and are connected to the inside of the drying chamber. Several placement screens are provided inside the drying chamber. The placement screens are respectively matched with several hot air flow ports and are detachably connected to the drying chamber. Several hot air passage holes are provided on the placement screens.
[0009] The hot air delivery assembly is installed inside the mounting cabinet, with one end extending into the outer casing. The hot air delivery assembly has hot air outlets on both sides of one end inside the outer casing that communicate with the hot air flow chamber. The other end of the hot air delivery assembly passes through one side of the mounting cabinet and extends out of the mounting cabinet.
[0010] Preferably, a placement assembly is fixedly provided on the inner side wall of the drying chamber, and the placement assembly is used to place several placement screens.
[0011] Preferably, the placement assembly includes several pairs of placement strips, and each pair of placement strips can hold a placement screen.
[0012] Preferably, the hot air delivery assembly includes a clean air delivery port, a first buffer box, a second buffer box, and a heating element. The clean air delivery port is fixedly installed on the rear side of the mounting cabinet. The first buffer box is fixedly installed inside the mounting cabinet and communicates with one end of the clean air delivery port. The second buffer box is installed inside the mounting cabinet, with one end located on top of the first buffer box and fixedly connected to the top of the first buffer box. The other end of the second buffer box extends into the outer casing and is fixedly connected to the outer casing. Hot air outlets are located on both sides of the second buffer box at one end inside the outer casing, for connecting the second buffer box and the hot air flow chamber. The top of the first buffer box has several grille holes communicating with the second buffer box. The heating element is installed inside the second buffer box and is detachably connected to the end of the first buffer box with grille holes.
[0013] Preferably, the other end of the clean air delivery port is connected to an external air purification device via an air delivery pipe.
[0014] Preferably, the air delivery duct is equipped with a first fan and a delivery solenoid valve. The first fan is used to deliver the clean air purified by the air purification equipment to the first buffer box through the air delivery duct and the clean air delivery port. The delivery solenoid valve is used to control the delivery of clean air.
[0015] Preferably, the heating element is an electric heating rod or an electric heating wire.
[0016] Preferably, the hot air exhaust pipe is connected to an external exhaust pipe that extends outside the production workshop.
[0017] Preferably, the discharge pipe is equipped with a one-way valve, a second fan, and an output solenoid valve. The second fan is used to discharge the hot and humid air in the drying chamber to the outside, the one-way valve is used to prevent the hot and humid air from flowing back, and the output solenoid valve is used to control the discharge of the hot and humid air.
[0018] Preferably, the drying chamber has a placement window on one side that communicates with the interior of the drying chamber. The placement window is used to place or remove the placement screen. The placement window extends through the outer chamber. The outer chamber has a door on one side for closing the placement window. One end of the outer chamber door is hinged to the outer chamber, and the other end is detachably connected to the outer chamber via a locking fastener. The locking fastener includes a locking block, a locking head, and a rotating handle. The locking block is fixedly mounted on one side of the outer chamber. The locking block has a locking rod, which is fixedly connected to the locking block. The locking head is located on one side of the outer chamber door and is rotatably connected to the outer chamber door. One side of the locking head has a locking groove that cooperates with the locking rod. The rotating handle is fixedly mounted on the other side of the locking head for driving the locking head.
[0019] Compared with the prior art, the present invention has the following beneficial effects:
[0020] This invention utilizes a hot air conveying assembly to deliver hot air into the outer chamber. The hot air enters the hot air flow chamber through hot air outlets on both sides, and is then evenly delivered into the drying chamber through hot air flow ports on both sides, ensuring full contact with the capsules placed on the screens. The multiple hot air flow ports facilitate sufficient contact between the hot air and each layer of capsules on the screens. Simultaneously, the hot air can flow between layers through the hot air through holes in the screens, and finally, the humid air is discharged through the top hot air exhaust pipe. This invention achieves uniform distribution of hot air within the drying chamber through the hot air flow chamber and multiple sets of hot air flow ports. Combined with the hot air through holes in the screens to enhance hot air penetration, it ensures that each layer of capsules receives uniform hot air, effectively solving the problem of uneven hot air circulation leading to significant differences in capsule drying in current hot air ovens, thus improving capsule drying efficiency and quality. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of a hot air circulating oven for capsule drying as described in an embodiment of this utility model;
[0023] Figure 2 This is as described in the embodiments of this utility model. Figure 1 A magnified schematic diagram of the local structure at point A;
[0024] Figure 3 This is a partial cross-sectional structural diagram of a hot air circulating oven for capsule drying as described in an embodiment of this utility model;
[0025] Figure 4 This is a partial structural diagram of a hot air circulating oven for capsule drying as described in this embodiment of the present invention. Figure 1 ;
[0026] Figure 5 This is as described in the embodiments of this utility model. Figure 4 A magnified schematic diagram of the local structure at point A;
[0027] Figure 6 This is as described in the embodiments of this utility model. Figure 4 A magnified schematic diagram of the local structure at point B;
[0028] Figure 7 This is a partial structural diagram of a hot air circulating oven for capsule drying as described in this embodiment of the present invention. Figure 2 ;
[0029] Figure 8 This is a partial structural diagram of a hot air circulating oven for capsule drying as described in this embodiment of the present invention. Figure 3 ;
[0030] Figure 9 This is a schematic diagram of the frame structure of a hot air circulating oven for capsule drying as described in an embodiment of this utility model;
[0031] Explanation of reference numerals in the attached figures:
[0032] 10-Drying chamber, 11-Outer chamber, 12-Mounting cabinet, 13-Hot air conveying assembly, 14-Hot air exhaust pipe, 15-Hot air flow chamber, 16-Hot air flow port, 17-Placement screen, 18-Hot air passage hole, 19-Hot air outlet, 20-Placement assembly, 21-Placement strip, 22-Clean air conveying port, 23-First buffer box, 24-Second buffer box, 25-Heating element, 26-Grate hole, 27-Air conveying pipe, 28-First fan, 29-Conveying solenoid valve, 30-Exhaust pipe, 31-One-way valve, 32-Second fan, 33-Output solenoid valve, 34-Placement window, 35-Outer chamber door, 36-Locking fastener, 37-Locking block, 38-Locking head, 39-Rotating handle, 40-Locking rod, 41-Locking groove. Detailed Implementation
[0033] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.
[0034] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.
[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0036] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.
[0037] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0038] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.
[0039] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0040] Example:
[0041] like Figures 1 to 9 As shown, this embodiment discloses a hot air circulating oven for capsule drying, including a drying chamber 10, an outer chamber 11, a mounting cabinet 12, and a hot air conveying assembly 13. The drying chamber 10 is disposed inside the outer chamber 11 and is fixedly connected to the outer chamber 11. The outer chamber 11 is disposed on the mounting cabinet 12 and is fixedly connected to the top of the mounting cabinet 12.
[0042] The top of the drying chamber 10 is provided with a hot air exhaust pipe 14. One end of the hot air exhaust pipe 14 is connected to the inside of the drying chamber 10, and the other end passes through the outer chamber 11 and extends to the outside of the outer chamber 11. Hot air flow chambers 15 are provided between the two sides of the drying chamber 10 and the outer chamber 11. Several hot air flow ports 16 are provided on the two sides of the drying chamber 10 and are connected to the inside of the drying chamber 10. Several placement screens 17 are provided inside the drying chamber 10. The several placement screens 17 are respectively matched with several hot air flow ports 16 and are detachably connected to the drying chamber 10. Several hot air passage holes 18 are provided on the several placement screens 17.
[0043] The hot air delivery assembly 13 is installed inside the mounting cabinet 12, and one end extends into the outer casing 11. The hot air delivery assembly 13 has hot air outlets 19 on both sides of one end inside the outer casing 11 that communicate with the hot air flow chamber 15. The other end of the hot air delivery assembly 13 passes through one side of the mounting cabinet 12 and extends out of the mounting cabinet 12.
[0044] This invention uses a hot air conveying assembly 13 to deliver hot air into the outer casing 11. The hot air enters the hot air flow chamber 15 through the hot air outlets 19 on both sides, and is then evenly delivered into the drying chamber 10 through the hot air flow ports 16 on both sides, ensuring full contact with the capsules placed on the screens 17. The multiple hot air flow ports 16 ensure that the hot air can fully contact each layer of capsules placed on the screens 17. Simultaneously, the hot air can flow between layers through the hot air through the hot air through holes 18 on the screens 17. Finally, the humid air is discharged through the top hot air exhaust pipe 14. This invention achieves uniform distribution of hot air within the drying chamber 10 through the hot air flow chamber 15 and multiple sets of hot air through ports 16. Combined with the hot air through holes 18 on the screens 17 to enhance hot air penetration, this ensures that each layer of capsules receives uniform hot air, effectively solving the problem of uneven hot air circulation leading to significant differences in capsule drying in current hot air ovens, thus improving capsule drying efficiency and quality.
[0045] To facilitate the placement or removal of the placement screens 17, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that a placement component 20 is fixedly provided on the inner side wall of the drying chamber 10. The placement component 20 is used to place a number of placement screens 17.
[0046] The placement component 20 includes several pairs of placement strips 21, and a placement screen 17 can be placed on each pair of placement strips 21.
[0047] The placement strip 21 facilitates the placement or removal of the placement screen 17, thereby enabling the capsule to be placed or removed quickly.
[0048] To achieve a more uniform hot air distribution, this embodiment is an improvement upon the previous embodiment. The difference lies in that the hot air delivery assembly 13 includes a clean air delivery port 22, a first buffer box 23, a second buffer box 24, and a heating element 25. The clean air delivery port 22 is fixedly mounted on the rear side of the mounting cabinet 12. The first buffer box 23 is fixedly mounted inside the mounting cabinet 12 and communicates with one end of the clean air delivery port 22. The second buffer box 24 is mounted inside the mounting cabinet 12, with one end of the second buffer box 24 connected to the first buffer box 23. A buffer box 23 is fixedly connected to the top of the first buffer box 23. The other end of the second buffer box 24 extends into the outer casing 11 and is fixedly connected to the outer casing 11. Hot air outlets 19 are located on both sides of the second buffer box 24 located inside the outer casing 11, for connecting the second buffer box 24 and the hot air flow chamber 15. The top of the first buffer box 23 is provided with a plurality of grid holes 26 communicating with the second buffer box 24. The heating element 25 is located inside the second buffer box 24 and is detachably connected to the end of the first buffer box 23 with grid holes 26.
[0049] The first buffer box 23, the second buffer box 24, and the grid holes 26 achieve buffered and uniform hot air flow. Combined with the hot air flow chamber 15, multiple sets of hot air flow ports 16, and hot air passage holes 18 for placing the screen 17, hot air can penetrate the capsules evenly throughout the drying chamber 10, resulting in a more uniform hot air distribution. At the same time, the heating element 25 facilitates the heating of air to obtain hot air.
[0050] To prevent the capsule from being contaminated by impurities or bacteria in the air during the drying process, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that the other end of the clean air delivery port 22 is connected to an external air purification device through the air delivery pipe 27.
[0051] The air delivery pipe 27 is equipped with a first fan 28 and a delivery solenoid valve 29. The first fan 28 is used to deliver clean air purified by the air purification equipment to the first buffer box 23 through the air delivery pipe 27 and the clean air delivery port 22. The delivery solenoid valve 29 is used to control the delivery of clean air.
[0052] By obtaining clean air through an external air purification device, the direct use of air can be avoided, thus solving the problem that impurities and bacteria in the air can easily contaminate the capsules, reducing the capsule yield. Specifically, the first fan 28 provides power for the clean air, and the delivery solenoid valve 29 controls the input of the clean air.
[0053] As a further preferred embodiment, the heating element 25 is an electric heating rod or an electric heating wire. The heating element 25 can be an electric heating rod or an electric heating wire that can achieve the function of this utility model in the prior art.
[0054] To avoid the hot air affecting the room temperature, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that the hot air exhaust pipe 14 is connected to an external exhaust pipe 30 that extends outside the production workshop.
[0055] The discharge pipe 30 is equipped with a one-way valve 31, a second fan 32, and an output solenoid valve 33. The second fan 32 is used to discharge the hot and humid air in the drying chamber 10 to the outside. The one-way valve 31 is used to prevent the hot and humid air from flowing back. The output solenoid valve 33 is used to control the discharge of hot and humid air.
[0056] By connecting an external exhaust pipe 30 and extending it outside the production workshop, the hot and humid air generated during the capsule drying process can be easily discharged to the outside, thus avoiding any impact on the room temperature of the production workshop. Simultaneously, discharging the hot and humid air allows for air circulation within the drying chamber 10, facilitating capsule drying. A second fan 32 is used to discharge the hot and humid air, and an output solenoid valve 33 controls the discharge of this air.
[0057] To facilitate the placement and removal of the screen 17, this embodiment is an improvement upon the above embodiment. The difference from the above embodiment is that a placement window 34 communicating with the interior of the drying chamber 10 is provided on one side of the drying chamber 10. The placement window 34 is used to place or remove the screen 17. The placement window 34 passes through the outer chamber 11. An outer door 35 for closing the placement window 34 is provided on one side of the outer chamber 11. One end of the outer door 35 is hinged to the outer chamber 11, and the other end is detachably connected to the outer chamber 11 via a locking fastener 36. The locking fastener 36 includes a locking block 37, a locking head 38, and a rotating handle 39. The locking block 37 is fixedly disposed on one side of the outer chamber 11. A locking rod 40 is provided on the locking block 37. The locking rod 40 is fixedly connected to the locking block 37. The locking head 38 is disposed on one side of the outer door 35 and is rotatably connected to the outer door 35. A locking groove 41 that cooperates with the locking rod 40 is provided on one side of the locking head 38. The rotating handle 39 is fixedly disposed on the other side of the locking head 38 and is used to drive the locking head 38.
[0058] The detachable placement screen 17, along with the convenient placement window 34 and outer door 35, enhances operational convenience. Overall, it significantly improves capsule drying quality and production efficiency.
[0059] Working principle of this utility model:
[0060] Clean air generated by an external air purification device is delivered to the first buffer box 23 via the delivery solenoid valve 29 and clean air delivery port 22 by the first fan 28. Subsequently, the clean air enters the second buffer box 24 through the grille holes 26 at the top of the first buffer box 23, where it is heated into hot air by the heating element 25. The hot air enters the hot air flow chamber 15 through the hot air outlets 19 on both sides of one end of the outer casing 11 of the second buffer box 24, and is then evenly delivered to the interior of the drying box 10 through the hot air flow ports 16 on both sides, making full contact with the capsules placed on the placement screen 17, which is composed of several pairs of placement strips 21. Simultaneously, the hot air flows between layers through the hot air passage holes 18 on the placement screen 17. Finally, the humid and hot air inside the drying box 10 is discharged outside the production workshop through the hot air exhaust pipe 14 at the top, under the action of the second fan 32, via the exhaust pipe 30 composed of the output solenoid valve 33 and the one-way valve 31. The screen 17 is placed and removed through the placement window 34 on one side of the drying chamber 10. After the placement is completed, the placement window 34 is sealed and insulated by the outer door 35 and the locking fastener 36 consisting of locking block 37, locking head 38 and rotating handle 39.
[0061] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.
[0062] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A hot air circulating oven for drying capsules, characterized in that, It includes a drying chamber (10), an outer chamber (11), an installation cabinet (12), and a hot air conveying assembly (13). The drying chamber (10) is located inside the outer chamber (11) and is fixedly connected to the outer chamber (11). The outer chamber (11) is located on the installation cabinet (12) and is fixedly connected to the top of the installation cabinet (12). The top of the drying chamber (10) is provided with a hot air exhaust pipe (14). One end of the hot air exhaust pipe (14) is connected to the inside of the drying chamber (10), and the other end passes through the outer chamber (11) and extends to the outside of the outer chamber (11). Hot air flow chambers (15) are provided between the two sides of the drying chamber (10) and the outer chamber (11). Several hot air flow ports (16) connected to the hot air flow chambers (15) are provided on both sides of the drying chamber (10). The hot air flow ports (16) are connected to the inside of the drying chamber (10). Several placement screens (17) are provided inside the drying chamber (10). The several placement screens (17) are respectively matched with several hot air flow ports (16) and are detachably connected to the drying chamber (10). Several hot air passage holes (18) are provided on the several placement screens (17). The hot air delivery assembly (13) is installed inside the mounting cabinet (12) and one end extends into the outer casing (11). The hot air delivery assembly (13) is provided with hot air outlets (19) on both sides of one end inside the outer casing (11) that communicate with the hot air flow chamber (15). The other end of the hot air delivery assembly (13) passes through one side of the mounting cabinet (12) and extends to the outside of the mounting cabinet (12).
2. The hot air circulating oven for capsule drying according to claim 1, characterized in that, A placement assembly (20) is fixedly provided on the inner wall of the drying chamber (10). The placement assembly (20) is used to place several placement screens (17).
3. The hot air circulating oven for capsule drying according to claim 2, characterized in that, The placement assembly (20) includes several pairs of placement strips (21), on which a placement screen (17) can be placed.
4. A hot air circulating oven for capsule drying according to claim 3, characterized in that, The hot air delivery assembly (13) includes a clean air delivery port (22), a first buffer box (23), a second buffer box (24), and a heating element (25). The clean air delivery port (22) is fixedly installed on the rear side of the mounting cabinet (12). The first buffer box (23) is fixedly installed inside the mounting cabinet (12) and communicates with one end of the clean air delivery port (22). The second buffer box (24) is installed inside the mounting cabinet (12), and one end of the second buffer box (24) is located on the top of the first buffer box (23) and is fixedly connected to the top of the first buffer box (23). Then, the other end of the second buffer box (24) extends into the outer box (11) and is fixedly connected to the outer box (11). The hot air outlet (19) is located on both sides of the second buffer box (24) located inside the outer box (11) to connect the second buffer box (24) and the hot air flow chamber (15). The top of the first buffer box (23) is provided with several grid holes (26) that communicate with the second buffer box (24). The heating element (25) is located inside the second buffer box (24) and is detachably connected to the end of the first buffer box (23) that is provided with grid holes (26).
5. A hot air circulating oven for capsule drying according to claim 4, characterized in that, The other end of the clean air delivery port (22) is connected to an external air purification device through an air delivery pipe (27).
6. A hot air circulating oven for drying capsules according to claim 5, characterized in that, The air delivery pipe (27) is equipped with a first fan (28) and a delivery solenoid valve (29). The first fan (28) is used to deliver the clean air purified by the air purification equipment to the first buffer box (23) through the air delivery pipe (27) and the clean air delivery port (22). The delivery solenoid valve (29) is used to control the delivery of clean air.
7. A hot air circulating oven for drying capsules according to claim 6, characterized in that, The heating element (25) is an electric heating rod or an electric heating wire.
8. A hot air circulating oven for drying capsules according to claim 7, characterized in that, The hot air exhaust pipe (14) is connected to an external exhaust pipe (30) that extends to the outside of the production workshop.
9. A hot air circulating oven for drying capsules according to claim 8, characterized in that, The discharge pipe (30) is equipped with a one-way valve (31), a second fan (32) and an output solenoid valve (33). The second fan (32) is used to discharge the hot and humid air in the drying chamber (10) to the outside. The one-way valve (31) is used to prevent the hot and humid air from flowing back. The output solenoid valve (33) is used to control the discharge of hot and humid air.
10. A hot air circulating oven for capsule drying according to claim 9, characterized in that, A placement window (34) communicating with the interior of the drying chamber (10) is provided on one side of the drying chamber (10). The placement window (34) is used to place or remove the placement screen (17). The placement window (34) passes through the outer chamber (11). An outer door (35) for closing the placement window (34) is provided on one side of the outer chamber (11). One end of the outer door (35) is hinged to the outer chamber (11), and the other end is detachably connected to the outer chamber (11) through a locking fastener (36). The locking fastener (36) includes a locking block (37) and a locking mechanism. The locking head (38) and rotating handle (39) are fixedly installed on one side of the outer casing (11). The locking block (37) is provided with a locking rod (40), which is fixedly connected to the locking block (37). The locking head (38) is located on one side of the outer casing door (35) and is rotatably connected to the outer casing door (35). The locking head (38) is provided with a locking groove (41) on one side that cooperates with the locking rod (40). The rotating handle (39) is fixedly installed on the other side of the locking head (38) and is used to drive the locking head (38).