A hot air circulation vacuum drying apparatus

Abstract

The utility model discloses a hot -blast circulation vacuum drying equipment, including drying box, heating assembly, sealing door, flat car, drying box is located in factory building and is equipped with hot -blast drying assembly in drying box top, heating assembly is located in drying box, and heating assembly includes circulating row pipe, first heating box, circulating row pipe is equipped with several groups and is equipped with in drying box respectively in several groups circulating row pipe, and sealing door is located in one end of drying box, and flat car is located in one side of drying box, is used for sending the material of waiting dry to in drying box, improves the convenience and continuity of material loading and unloading, adopts the mode of circulating row pipe and high temperature medium heat exchange, compares traditional electric heating pipe or single hot -blast heating, and the heat source evenly releases from the all around of drying box, solves the problem of local overheating and uneven temperature distribution, makes material drying quality more stable, simultaneously, medium circulation heat exchange reduces heat loss, and cooperates hot -blast secondary heating, and the temperature rising speed is greatly improved, and drying period is shortened.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum drying technology, specifically relating to a hot air circulating vacuum drying device. Background Technology

[0002] In many industrial fields such as pharmaceuticals, food, and chemicals, drying materials is a key step in ensuring product quality, extending shelf life, and meeting subsequent processing requirements. Hot air circulating vacuum drying equipment is widely used in drying various heat-sensitive and easily oxidized materials because it can achieve low-temperature drying in a vacuum environment, effectively preventing material oxidation and deterioration, while accelerating the drying rate through hot air circulation.

[0003] Existing hot air circulating vacuum drying equipment typically employs direct heating methods, such as installing electric heating elements or heating plates inside the drying chamber, or using external heating devices to heat the gas introduced into the drying chamber before circulating it. However, directly installing heating elements inside the chamber can easily lead to localized overheating, resulting in uneven temperature distribution within the drying chamber. Materials near the heating elements are prone to overheating and charring, while areas further away from the heating elements heat up slowly, affecting overall drying efficiency and the consistency of drying quality. Furthermore, when using external heating devices to heat the circulating gas, heat loss occurs during gas transportation, and the gas is difficult to diffuse quickly and evenly throughout the drying chamber, resulting in a slow overall heating rate and low energy efficiency. This problem of insufficient heating uniformity and heating efficiency is particularly prominent when processing large quantities of materials or in scenarios requiring high drying uniformity, severely restricting the improvement of production efficiency and the assurance of product quality. Utility Model Content

[0004] The purpose of this invention is to provide a hot air circulating vacuum drying device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hot air circulating vacuum drying device, comprising:

[0006] A drying oven, which is located inside the factory and has a hot air drying assembly on the top to achieve hot air circulation drying function;

[0007] A heating assembly, located inside the drying chamber, is used to rapidly increase the temperature inside the drying chamber and provide a uniform and stable heat source for material drying. The heating assembly includes a circulating pipe and a first heating chamber. The circulating pipe is provided in several groups, and each group of circulating pipes is located inside the drying chamber. The high-temperature medium is heated by the first heating chamber and transported into the circulating pipe to enable the circulating pipe to release heat efficiently, ensuring that the temperature inside the drying chamber rises rapidly and the heat source is released uniformly.

[0008] A sealing door is located at one end of the drying oven and is used to seal the drying oven. The bottom of the sealing door is equipped with a driving component to drive the sealing door to move, so as to realize the flexible opening and closing of the sealing door, which not only ensures the sealing performance of the drying oven, but also facilitates the handling of materials.

[0009] A flatcar, located on one side of the drying chamber, is used to transport materials to be dried into the drying chamber, improving the convenience and continuity of material loading and unloading.

[0010] Preferably, the drying chamber is provided with a base frame on one side, and the first heating chamber is provided with two sets, both sets of the first heating chamber are provided on the base frame. The base frame is provided with two sets of hot oil pumps, the input end of the hot oil pump is connected to the first heating chamber through a pipe, and the output end is connected to the oil delivery pipe.

[0011] Preferably, the two ends of the circulation pipe are respectively connected to an oil inlet and an oil outlet. The oil inlet is connected to an oil delivery pipeline, and the oil outlet is connected to an oil outlet pipeline, with the other end of the oil outlet pipeline connected to the first heating box.

[0012] Preferably, the top of the drying chamber is connected to an expansion chamber, and the expansion chamber is connected to the oil pipeline via a branch pipe.

[0013] Preferably, the driving component includes a first geared motor, which is connected to one bottom end of the sealed door via a mounting bracket. The output shaft of the first geared motor is connected to a first roller via a gearbox, and the other bottom end of the sealed door is rotatably connected to a second roller via a rotating bracket.

[0014] Preferably, the factory building is connected to a guide slide groove, one end of the mounting frame is connected to a guide slide rod and one end of the guide slide rod is slidably connected to the guide slide groove, a sliding frame is connected to the factory building, and the top of the sealing door is slidably connected to the sliding frame via a slider.

[0015] Preferably, one end of the flatcar is connected to a fixed frame and a second reduction motor is provided on the fixed frame. The output shaft of the second reduction motor is connected to a first bevel gear. The bottom of the flatcar is rotatably connected to a drive rod through a bearing seat, and one end of the drive rod is connected to a second bevel gear that meshes with the first bevel gear.

[0016] Preferably, the bottom of the flatcar is rotatably connected to several shafts via bearing seats, and the two ends of the shafts are connected to rolling wheels. The drive rod and the middle of the shafts are both fixedly fitted with drive components, and the drive components are connected to each other by drive belt transmission.

[0017] Preferably, the hot air drying assembly includes a fan connected to the top of the drying chamber. The fan's air inlet is connected to the drying chamber via a pipe, and its air outlet is connected to a second heating chamber via a pipe. One end of the top of the second heating chamber is connected to the drying chamber via a pipe.

[0018] Preferably, the factory building is equipped with a connecting frame and a number of vacuum pumps on the top of the connecting frame. One end of each vacuum pump is connected to a bend in the pipe, and the other end of the bend is connected to a horizontal vacuum condenser. The connecting frame is equipped with two sets of Roots pumps. The input end of one set of Roots pumps is connected to the drying chamber, and the output end is connected to the other set of Roots pumps through a pipe. The output end of the other set of Roots pumps is connected to the horizontal vacuum condenser. One end of the horizontal vacuum condenser is connected to the chiller box through a pipe.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] (1) The method of circulating pipe and high temperature medium heat exchange is adopted. Compared with traditional electric heating pipe or single hot air heating, the heat source is evenly released from all sides of the drying box, which solves the problems of local overheating and uneven temperature distribution, making the drying quality of materials more stable. At the same time, the medium circulation heat exchange reduces heat loss. Combined with the secondary heating of hot air, it greatly improves the heating speed and shortens the drying cycle.

[0021] (2) The sealing door is automatically opened and closed by motor drive, and the flat car is mechanically driven to transport materials, reducing manual handling costs and improving loading and unloading continuity; the cooperation between the guide chute and the sliding frame ensures that the sealing door runs smoothly, which not only ensures the sealing of the vacuum environment, but also facilitates quick operation.

[0022] (3) The expansion tank reduces pipeline losses caused by pressure fluctuations, extends equipment service life, and the closed-loop circulation of the medium reduces energy waste. The coordinated control of the hot oil pump and the heating tank makes heat utilization more efficient and reduces equipment energy consumption.

[0023] (4) The combination of Roots pump and vacuum pump enables rapid vacuuming, and the horizontal vacuum condenser promptly handles water vapor, preventing the humidity inside the chamber from rising again, further improving drying efficiency and ensuring that the moisture content of the material meets the standard. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2This is a schematic diagram of the internal circulation pipe structure of the drying oven of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the bottom of the flatbed cart of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the first geared motor and the first roller of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the base frame and connecting frame of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the circulating pipe of this utility model.

[0030] In the diagram: 1. Drying oven; 2. Circulation pipe; 3. First heating box; 4. Sealed door; 5. Flatcar; 6. Workshop; 7. Base frame; 8. Hot oil pump; 9. Oil pipeline; 10. Oil inlet; 11. Oil outlet; 12. Oil outlet pipeline; 13. Expansion tank; 14. Branch pipe; 15. First geared motor; 16. First roller; 17. Guide slide; 18. Mounting frame; 19. Guide slide rod; 20. Second geared motor; 21. Fixed frame; 22. First bevel gear; 23. Rotating shaft; 24. Rolling wheel; 25. Drive rod; 26. Drive component; 27. Sliding frame; 28. Fan; 29. ​​Second heating box; 30. Connecting frame; 31. Vacuum pump; 32. Bend; 33. Horizontal vacuum condenser; 34. Roots pump; 35. Chiller box; 36. Control box; 37. Second bevel gear. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved with", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0033] This utility model provides, for example Figure 1-6 The hot air circulating vacuum drying equipment shown includes:

[0034] Drying box 1, which is located inside the factory building 6 and has a hot air drying component on the top, is used to achieve uniform heat diffusion inside the box through forced airflow circulation, thereby improving drying efficiency and material drying consistency.

[0035] A heating component is installed inside the drying chamber 1 to rapidly increase the temperature inside the drying chamber 1 and form a three-dimensional uniform heat source field, providing a stable thermal environment for material drying. The heating component includes a circulation pipe 2 and a first heating chamber 3. The circulation pipe 2 is provided in several groups and is distributed in multiple dimensions inside the drying chamber 1. The first heating chamber 3 heats the high-temperature medium and forms a closed-loop circulation system, so that the high-temperature medium continuously flows and releases heat in the circulation pipe 2, achieving a rapid and uniform increase in temperature inside the drying chamber 1.

[0036] A sealing door 4 is located at one end of the drying chamber 1 to form a vacuum-sealed cavity. The bottom of the sealing door 4 is equipped with a driving component to realize the automatic sliding opening and closing of the sealing door 4, which can not only ensure the sealing performance of the drying chamber 1 under vacuum, but also realize the efficient switching of material loading and unloading.

[0037] Flatbed cart 5 is located on one side of drying box 1 and is used to carry materials and realize automated feeding and discharging. The mechanical transmission structure ensures the stability and continuity of material transportation and reduces the intensity of manual operation.

[0038] The drying chamber 1 is provided with a base frame 7 on one side. The first heating chamber 3 is provided with two sets and symmetrically distributed on the base frame 7 to form a dual-circuit heating redundancy system. The base frame 7 is provided with two sets of hot oil pumps 8. The input end of the hot oil pump 8 is connected to the first heating chamber 3 through a pipeline, and the output end is connected to the oil pipeline 9. It is used to provide a power source for the circulation of high-temperature medium and realize the high-pressure and efficient transportation of the medium.

[0039] The two ends of the circulation pipe 2 are respectively connected to the oil inlet 10 and the oil outlet 11. The oil inlet 10 is connected to the oil pipeline 9, and the oil outlet 11 is connected to the oil outlet pipeline 12. The other end of the oil outlet pipeline 12 is connected to the first heating box 3, forming a closed circulation loop to realize the repeated recycling of the high-temperature medium and reduce heat loss.

[0040] The top of the drying chamber 1 is connected to an expansion chamber 13, and the expansion chamber 13 is connected to the oil pipeline 9 through a branch pipe 14. This is used to buffer the volume change of the high-temperature medium caused by thermal expansion and contraction, balance the pressure fluctuations in the system, and ensure the safe and stable operation of the pipeline system.

[0041] The driving component includes a first geared motor 15, which is connected to one bottom end of the sealing door 4 via a mounting bracket 18. The output shaft of the first geared motor 15 is connected to a first roller 16 via a gearbox. The other bottom end of the sealing door 4 is rotatably connected to a second roller via a rotating bracket. The motor drives the roller to move the sealing door 4 with low resistance, ensuring the smoothness and precise positioning of the opening and closing process.

[0042] The workshop 6 is connected to a guide slide 17. One end of the mounting frame 18 is connected to a guide slide rod 19, and one end of the guide slide rod 19 is slidably connected to the guide slide 17. The workshop 6 is connected to a sliding frame 27. The top of the sealing door 4 is slidably connected to the sliding frame 27 through a slider, forming a bidirectional guide constraint structure to ensure the parallelism of the sealing door 4 with the door frame of the drying oven 1 during translation and improve the sealing fit accuracy.

[0043] One end of the flatcar 5 is connected to a fixed frame 21, and a second reduction motor 20 is provided on the fixed frame 21. The output shaft of the second reduction motor 20 is connected to a first bevel gear 22. The bottom of the flatcar 5 is rotatably connected to a drive rod 25 through a bearing seat, and one end of the drive rod 25 is connected to a second bevel gear 37 that meshes with the first bevel gear 22. The vertical conversion of the power direction is realized through bevel gear transmission, providing stable driving force for the flatcar 5.

[0044] The bottom of the flatcar 5 is rotatably connected to several rotating shafts 23 via bearing seats, and the two ends of the rotating shafts 23 are connected to rolling wheels 24. The drive rod 25 and the middle of the rotating shafts 23 are both fixedly fitted with drive components 26, and the several drive components 26 are connected by drive belt transmission to form a multi-axis synchronous drive structure, which ensures that the flatcar 5 can still maintain stable operation when carrying heavy objects and avoids material shaking. The drive component 26 can be a synchronous pulley or a sprocket. Correspondingly, the drive belt is adapted to a synchronous belt or a chain. When a synchronous pulley and a synchronous belt are combined, non-slip transmission is achieved through tooth meshing. When a sprocket and a chain are combined, rigid transmission is achieved through chain link and wheel tooth meshing. The configuration can be selected according to actual needs.

[0045] The hot air drying assembly includes a fan 28, which is connected to the top of the drying chamber 1. The air inlet of the fan 28 is connected to the drying chamber 1 through a pipe, and the air outlet is connected to a second heating chamber 29 through a pipe. One end of the top of the second heating chamber 29 is connected to the drying chamber 1 through a pipe, forming a hot air internal circulation system. The heat loss is compensated by secondary heating, the airflow disturbance inside the chamber is enhanced, and the temperature field is promoted to be uniformly distributed.

[0046] The workshop 6 is equipped with a connecting frame 30, and the top of the connecting frame 30 is equipped with several vacuum pumps 31. One end of each vacuum pump 31 is connected to a bend 32 via a pipe, and the other end of the bend 32 is connected to a horizontal vacuum condenser 33. The connecting frame 30 is equipped with two sets of Roots pumps 34. The input end of one set of Roots pumps 34 is connected to the drying chamber 1, and the output end is connected to the other set of Roots pumps 34 via a pipe. The output end of the other set of Roots pumps 34 is connected to the horizontal vacuum condenser 33. One end of the horizontal vacuum condenser 33 is connected to the chiller box 35 via a pipe, forming a multi-stage vacuum pumping system and a water vapor treatment unit. This enables rapid vacuuming and immediate condensation and separation of evaporated water vapor, avoiding water vapor backflow that could affect the drying effect.

[0047] In this hot air circulating vacuum drying equipment, the material to be dried is placed on a flatcar 5. The operator pushes the flatcar 5 to the feed inlet on one side of the drying chamber 1. The drive system at the bottom of the flatcar 5 then starts, with the second reduction motor 20 starting to run. Its output shaft is connected to the first bevel gear 22. Through the meshing transmission of the first bevel gear 22, the second bevel gear 37 is driven to rotate, which in turn drives the drive rod 25 to rotate. This, in turn, causes the drive component 26 on the drive rod 25 to rotate. The drive component 26 on the drive rod 25 forms a transmission engagement with the drive component 26 on the rotating shaft 23 through a drive belt. When the drive component 26 on the drive rod 25 rotates, it drives the drive belt to circulate through friction. The drive belt and the drive component 26 on the rotating shaft 23 are connected, thus driving... The rotating shaft 23 rotates, and the rotating shaft 23 transmits power to the rolling wheel 24, causing the rolling wheel 24 to roll, realizing the smooth transport of the flat car 5 and the material until it is sent into the drying chamber 1. After the material is in place, the control box 36 controls the sealing door 4 to start the closing procedure. The first reduction motor 15 at the bottom of the sealing door 4 drives the first roller 16 to rotate. The roller contacts the ground and generates driving force. At the same time, the slider at the top of the sealing door 4 is embedded in the groove of the sliding frame 27 and slides along the sliding frame 27 as the sealing door 4 moves, forming a double guide. Under the action of driving force and guidance, the bottom of the sealing door 4 moves slowly along the guide groove 17 until it is tightly fitted with the door frame of the drying chamber 1. The sealing strip on the edge of the door frame achieves complete sealing, laying a solid foundation for the subsequent establishment of a vacuum environment.

[0048] After the drying chamber 1 is sealed, the control box 36 controls the heating element inside the first heating chamber 3 to start working. Since the top of the first heating chamber 3 is equipped with a filling port, a high-temperature medium (such as heat transfer oil) can be added into the heating pipe inside the first heating chamber 3 through the filling port, and the heating element heats the high-temperature medium inside the first heating chamber 3, so that the medium temperature gradually rises to the set value (set according to the material drying requirements). When the high-temperature medium reaches the preset temperature, the hot oil pump 8 starts. The input end of the hot oil pump 8 pumps the high-temperature medium into the oil delivery pipe 9, and the high-temperature medium is pressurized and delivered to the oil inlet 10 of the circulation pipe 2 through the oil delivery pipe 9. The circulation pipe 2 is distributed in multiple parallel arrangements around the inner wall of the drying chamber 1 and at the top and bottom of the drying chamber 1. The pipes in section 2 are connected by elbows to form a continuous passage. After the high-temperature medium enters the circulation pipe 2, it flows along the inside of the circulation pipe 2 and exchanges heat with the air in the drying box 1, continuously releasing heat and causing the temperature inside the box to gradually rise. The low-temperature medium that has completed the heat exchange flows into the oil outlet pipe 12 through the oil outlet port 11 of the circulation pipe 2, and finally flows back to the heating pipe inside the first heating box 3 for reheating, forming a stable closed loop. During this process, the expansion box 13 is connected to the oil pipeline 9 through the branch pipe 14. When the medium expands in volume due to temperature changes, some of the medium flows into the expansion box 13 for temporary storage. When the temperature decreases and the medium shrinks in volume, the medium in the expansion box 13 flows back to the pipeline, thereby balancing the pressure in the system and preventing the pipeline from being damaged due to sudden pressure changes.

[0049] While the circulating pipe 2 heats the drying chamber 1, the control box 36 controls the fan 28 installed on the top of the drying chamber 1 to start. The impeller of the fan 28 rotates at high speed, drawing air from the drying chamber 1 through the air inlet and sending it through the air outlet into the heating pipe inside the second heating chamber 29. The second heating chamber 29 heats the air inlet again, raising the air temperature, and then sends the hot air back into the drying chamber 1 through the air outlet. The hot air forms multiple airflows inside the chamber, which merge with the heat released by the circulating pipe 2. At the same time, the airflow continuously flows inside the chamber, carrying heat and spreading it to every corner of the drying chamber 1, reducing the temperature difference between different areas inside the chamber and ensuring uniform temperature distribution.

[0050] After a period of hot air drying, the Roots pump 34 and vacuum pump 31, fixed on the control frame 30 and control housing 36, first perform a rough vacuum evacuation of the drying chamber 1 by the Roots pump 34 to quickly reduce the air pressure inside the chamber. Then, the vacuum pump 31 takes over to further reduce the air pressure inside the chamber to the set vacuum level. During the drying process, vacuuming will be performed continuously or intermittently to maintain the set vacuum level. As the continuous evaporation of moisture inside the material will cause the pressure inside the chamber to rise, the vacuum pump 31 will start in a timely manner based on the feedback from the pressure sensor inside the drying chamber 1 to remove excess gas. The water vapor is extracted to maintain a stable vacuum environment. At this time, the blower 28 continues to work, driving a small amount of gas to circulate in the chamber, so that the heat is evenly distributed. When the Roots pump 34 and the vacuum pump 31 are working, the water vapor generated by evaporation is drawn into the horizontal vacuum condenser 33 through the pipe. Cooling water supplied by the chiller box 35 is introduced into the condenser tube inside the horizontal vacuum condenser 33. After the water vapor comes into contact with the outer wall of the condenser tube, it is cooled and condenses into liquid water droplets, which flow along the tube wall into the water collection device at the bottom of the condenser to prevent water vapor from flowing back to the material and ensure that the drying process continues.

[0051] Once the material reaches the set drying level, the control box 36 sends a signal, and the hot air drying component and the heating component shut down one after another. The temperature slowly drops to room temperature. Then, the control box 36 controls the first reduction motor 15 of the sealing door 4 to rotate in reverse, driving the first roller 16 to rotate in reverse, and moving the sealing door 4 along the guide slide 17 away from the drying chamber 1 until it is fully open. The flatcar 5 starts, and the rolling wheel 24 rotates in reverse, smoothly transporting the dried material out of the drying chamber 1, completing the entire drying process.

[0052] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., 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 vacuum drying device, characterized in that, include: Drying box (1), the drying box (1) is located in the factory building (6) and the top of the drying box (1) is equipped with a hot air drying component to realize the hot air circulation drying function; The heating component is located inside the drying chamber (1) and is used to quickly raise the temperature inside the drying chamber (1) and provide a uniform and stable heat source for drying materials. The heating component includes a circulating pipe (2) and a first heating chamber (3). The circulating pipe (2) is provided with several sets and the several sets of circulating pipes (2) are respectively located inside the drying chamber (1). The high-temperature medium is heated by the first heating chamber (3) and transported into the circulating pipe (2) so that the circulating pipe (2) can release heat efficiently, ensuring that the temperature inside the drying chamber (1) rises rapidly and the heat source is released uniformly. A sealing door (4) is located at one end of the drying box (1) and is used to seal the drying box (1). The bottom of the sealing door (4) is provided with a driving component to drive the sealing door (4) to move, so as to realize the flexible opening and closing of the sealing door (4), which not only ensures the sealing performance of the drying box (1) but also facilitates the handling of materials. Flatbed cart (5), which is located on one side of the drying box (1), is used to transport the material to be dried into the drying box (1) to improve the convenience and continuity of material loading and unloading.

2. The hot air circulating vacuum drying equipment according to claim 1, characterized in that: The drying box (1) is provided with a base frame (7) on one side. The first heating box (3) is provided with two sets and both sets of the first heating box (3) are provided on the base frame (7). The base frame (7) is provided with two sets of hot oil pumps (8). The input end of the hot oil pump (8) is connected to the first heating box (3) through a pipe, and the output end is connected to the oil pipeline (9).

3. The hot air circulating vacuum drying equipment according to claim 2, characterized in that: The two ends of the circulation pipe (2) are respectively connected to an oil inlet (10) and an oil outlet (11). The oil inlet (10) is connected to the oil pipeline (9), and the oil outlet (11) is connected to the oil outlet pipeline (12). The other end of the oil outlet pipeline (12) is connected to the first heating box (3).

4. The hot air circulating vacuum drying equipment according to claim 2, characterized in that: The top of the drying box (1) is connected to an expansion box (13), and the expansion box (13) is connected to the oil pipeline (9) through a branch pipe (14).

5. The hot air circulating vacuum drying equipment according to claim 1, characterized in that: The driving component includes a first geared motor (15), which is connected to one end of the bottom of the sealing door (4) via a mounting bracket (18). The output shaft of the first geared motor (15) is connected to a first roller (16) via a gearbox. The other end of the bottom of the sealing door (4) is rotatably connected to a second roller via a rotating bracket.

6. The hot air circulating vacuum drying equipment according to claim 5, characterized in that: The factory building (6) is connected to a guide slide (17), one end of the mounting frame (18) is connected to a guide slide rod (19) and one end of the guide slide rod (19) is slidably connected to the guide slide (17), the factory building (6) is connected to a sliding frame (27), and the top of the sealing door (4) is slidably connected to the sliding frame (27) by a slider.

7. The hot air circulating vacuum drying equipment according to claim 1, characterized in that: One end of the flatcar (5) is connected to a fixed frame (21) and a second reduction motor (20) is provided on the fixed frame (21). The output shaft of the second reduction motor (20) is connected to a first bevel gear (22). The bottom of the flatcar (5) is rotatably connected to a drive rod (25) through a bearing seat, and one end of the drive rod (25) is connected to a second bevel gear (37) that meshes with the first bevel gear (22).

8. The hot air circulating vacuum drying equipment according to claim 7, characterized in that: The bottom of the flatcar (5) is rotatably connected to several shafts (23) via bearing seats, and the two ends of the shafts (23) are connected to rolling wheels (24). The drive rod (25) and the shafts (23) are both fixedly fitted with drive components (26), and the several drive components (26) are connected to each other by drive belt transmission.

9. A hot air circulating vacuum drying device according to claim 1, characterized in that: The hot air drying assembly includes a fan (28), which is connected to the top of the drying chamber (1). The air inlet of the fan (28) is connected to the drying chamber (1) through a pipe, and the air outlet is connected to a second heating chamber (29) through a pipe. One end of the top of the second heating chamber (29) is connected to the drying chamber (1) through a pipe.

10. A hot air circulating vacuum drying device according to claim 1, characterized in that: The workshop (6) is equipped with a connecting frame (30) and a number of vacuum pumps (31) are provided on the top of the connecting frame (30). One end of the vacuum pump (31) is connected to a bend (32) through a pipe and the other end of the bend (32) is connected to a horizontal vacuum condenser (33). The connecting frame (30) is equipped with two sets of Roots pumps (34). The input end of one set of Roots pumps (34) is connected to the drying box (1), and the output end is connected to the other set of Roots pumps (34) through a pipe. The output end of the other set of Roots pumps (34) is connected to the horizontal vacuum condenser (33). One end of the horizontal vacuum condenser (33) is connected to the chiller box (35) through a pipe.

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